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Numbers are fun. Wait, no, don’t run away, Pandas! Please come back! Even though some of us might have PTSD flashbacks to math class whenever we’re forced to do anything more difficult than basic sums, there’s no denying how impressive genuine math skills can be.

And some math wonders take numbers very seriously, doing (probably) unnecessary calculations that are very impressive. The r/theydidthemath subreddit (not to be confused with its polar opposite, r/theydidndothemath) is the place for math-lovers to flex their skills in real-world situations.

We’ve collected some of the biggest math dunks from people who really took their time and did the math, so check ‘em out. Upvote your fave images as you scroll down and let us know in the comments about the awesome times that math proved incredibly useful.

#1

Serving Up Some Math To A Twitter Hypocrite

Serving Up Some Math To A Twitter Hypocrite

BehindMySarcasm Report

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David K
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

So in other words, given that you are awake for about 16 hours a day, it means that you post approximately 1,75 post an hour.

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Over 697k people make up the r/theydidthemath community and it’s been active since the Spring of 2013. Since then, they’ve partnered up and made friends with lots of other math and science-related subreddits that show the joys of being competent in your field and mixing that with a good sense of humor.

The r/theydidthemath subreddit isn’t just for showing off, though. It’s a friendly community that encourages people to ask for help from its members with any math-related problems that are making their lives miserable.

#4

Finnish People Might Not Exist..?

Finnish People Might Not Exist..?

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Vic
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Hahaha! Brilliant.. Now I'm wondering, where I really went when I visited Helsinki..

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#6

So, About All Those "Lazy, Entitled" Millenials...

So, About All Those "Lazy, Entitled" Millenials...

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Bill
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Federal student loans became common by 1972. Then the prices started skyrocketing. Kinda like the graph between the rise of health insurance and staggering prices. The rise of the unions also helped in the college price increases

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Like with all things in life, getting good at math means putting in the time and practicing. You could have the best tutors, the brightest study buddies, and the most brilliant textbooks by your side (they certainly don’t hurt), but at the end of the day it all comes down to you sitting down and solving problems the old fashioned way.

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With a sharpened pencil. A piece of paper. And an eraser the size of your headache. It’s about focused, smart, and daily practice. I’ll be completely honest with you for a moment: every single time that I was falling behind in math class, I’d get my grades back up when I put in genuine effort.

#7

A Whale Died With 64 Lbs Of Plastic In Its Stomach

A Whale Died With 64 Lbs Of Plastic In Its Stomach

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Sk8_boy
Community Member
3 years ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Im whaling at the top of my lunges #savethewhale upvote if you think something should be done about this

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#8

Approximately Speaking, Is This Correct?

Approximately Speaking, Is This Correct?

0–14 years: 18.73% (male 31,255,995/female 29,919,938)
15–24 years: 13.27% (male 22,213,952/female 21,137,826)
so 32% of the U.S.A. are between 0-24.
Assuming an equal distribution and only kids between 6-18 go to school we have around 16% of 6-18 year olds (12 years from a span of 24 years).
Assuming EVERY KID at any given time has to be in a class that means there is one teacher for every 15 kids or so. (Only public school). That's a lot of teachers.

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cybermerlin2000
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Or you could put it into a proper health service such as the rest of the world has got

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#9

"Do You Think I Have Peed 1 Million Times In My Life?"

"Do You Think I Have Peed 1 Million Times In My Life?"

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But I’d never have made it if I didn’t have some incredibly friendly math sorcerers by my side, explaining things to me like I was 5 years old. Once you get the logic behind why certain calculations work like they do, things come more naturally… until you hit the next big roadblock. Hey, we can’t all be great at math (and I peaked in that area in the 3rd grade, unlike those who take their time and Do. The. Math.).

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#10

Is This Correct?

Is This Correct?

Because our years are based around Jesus, and we are barely in to this year, I will say it has been 2019 years since Jesus’ birth. There are 8,760 hours in a year, and if you work 8 hours a day, every day, you will work about 2,920 hours a year. 2,920 hours a year for 2019 years is 5,895,480 hours in total. If you make 2,000 dollars each hour for 5,895,480 hours, you will make $11,790,960,000.
According to Forbes there will be 39 people richer than you

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Kirsten Kerkhof
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I'm trying to see how this concentration of wealth is okay, but ... I just can't ...

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#11

Is This True?

Is This True?

According to wikipedia, there are 2153 billionaires. They have a combined wealth of $8.7 Trillion. Subtracting $1B for each from that total leaves $6.547 T. So thats roughly correct, if a little bit low.

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Hans
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Since most of this money is bound in assets (like companies), this math does not work. It is not liquid money! Removing this money means removing these assets, which essentially would be collectivism, as has been practices by communism. And, as learned from history, this does not lead to more welfare for all, but less. The solution really would be to tax income from capital higher than that from work.

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#12

Jasmine And Aladdin

Jasmine And Aladdin

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cybermerlin2000
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I had this explained to me some time ago by my then 7-year-old niece. The patterns on the carpet are magic patterns and show what they do. The border is the part that lifts it by sending magic power down. The arrow shapes in the corner make it, so you can steer it by sending magic out of the corners. The swirly pattern is pretend gravity, so you don't fall off and the pattern in the middle makes a bubble around everyone to protect them from dangerous things when flying like running out of air or getting squashed when you fly too fast and the flame patterns are for the forward and stopping magic. So, to translate, the Square pattern around the edge is vertical ion thrust. Arrow patterns in the corners are 360 degree horizontal thrust the swirling purple pattern is artificial gravity, the circular pattern is a force field generator and artificial atmosphere and the flame patterns are accelerator and reverse thrusters. I asked why people can still fall off, and she said "No seatbelts"

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#18

What Would The WiFi Password Be?

What Would The WiFi Password Be?

π.

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#19

Have I Eaten A Full Cow?

Have I Eaten A Full Cow?

ZylkaLeftridge Report

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Paul Mitchell
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Almost half the live weight is lost as hide, guts, feet, most of the head, then there is the bone. The amount that's eaten is probably around 30% of live weight.

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#20

What Are The Odds Of Guessing It Right?

What Are The Odds Of Guessing It Right?

Let's assume this is the USA. There were 165.92 million women and girls in the USA as of 2017. There's been some variation in the number of "Amandas" in the USA across sources, but 778,954 seems to be near the middle. That means around 0.4695% of the female population is named Amanda, and OP had a 0.4695% chance of who he called "Amanda" actually being named Amanda.

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#23

When Your Barber Doesn't Study Math

When Your Barber Doesn't Study Math

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#24

1 In 12 Chance Of Dying In Office

1 In 12 Chance Of Dying In Office

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#25

Is This A Fair Representation Of The Sun To Earth Ratio?

Is This A Fair Representation Of The Sun To Earth Ratio?

The ratio for the radius is 100 to 1. Looks about right.
The Sun has 1 million times the volume of Earth, so you could fit several hundred thousand Earth-balls in.

live4lifelegit Report

#26

The Force Of A Carrot Falling At Terminal Velocity

The Force Of A Carrot Falling At Terminal Velocity

First : the terminal velocity of a carrot is NOT 147 mph A carrot has the same density as a human.
A human terminal velocity falling head first is approx 120 mph. The terminal velocity of two similar things falling is greater for something big because it has less friction by lbs than for something small. So a carrot can not fall that fast.
Second : the carrot will fall with the large side first. The thin part has more drag. Think of a drop falling. It's the same principe an you can try it by throwing a hammer.
Third : the force depends of the duration of the impact so it will have a greater force if it hit concrete and a lower force if it hit mud.
We need to calculate the kinetic energy If we take 0,1kg and 50mph (80km/h=22m/s) wich is more realistic as a final velocity we have E= 0,5mv2 E=0,50,122*22 E=24J
24J will probably hurt you way way less than a punch.

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Kathryn Baylis
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I thought they were dropping them from helicopters at a very low altitude, so the vegetables wouldn’t burst on impact.

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#27

Super Soaker Math

Super Soaker Math

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#29

The One Time I Was Actually Intrigued On Doing The Math Myself

The One Time I Was Actually Intrigued On Doing The Math Myself

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Kathryn Baylis
Community Member
3 years ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

It can be done. Long marriage + a hubby whose wife will always be 24/7/365 hot in his eyes.

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#30

Spongebob Lowkey Ripped

Spongebob Lowkey Ripped

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Rissie
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Spongebob is not your average kitchen sponge thank you very much! He's been employee of the month since he could walk!

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#31

Math Break

Math Break

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Phil Boswell
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Short answer is "could be anything" because it's possible to construct a function going through any five points, just like they did here.

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#32

The Price Of Wings

The Price Of Wings

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Downunderdude
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I love these people. Gloriously pointless and just what we need.

moconnell avatar
M O'Connell
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

it would seem like they are taking into account the cost/wing/serving tray price. I would assume the restaurant has vessels which hold 25-wing increments, and beyond 100 wings, they would use a large foodservice pan.

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Gulinky Lu
Community Member
3 years ago (edited) DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I have found a semi-working formula. -0.000000002122467098x^4+0.000001105525958x^3-0.0001811283712x^2+1.120601413x+0.1732590169 Strangely enough...another one that almost works is 1.1550593787395x^(0.99197095560133).

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JD Lee
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I’d just go to a sports bar on AYCE wing night for $10. Nobody survives 200 wings... Sometimes it’s easier to bypass math & get straight to business.

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Ashley Farrell
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Could it also be factoring the cost of the togo containers. wings x cost + #of containers x cost

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TexasWoman
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I always do the math at stores—in my head—to see what’s a better deal.

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#33

That’s A Lot Of Trees

That’s A Lot Of Trees

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cybermerlin2000
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

150000 trees per person working 8 hours a day 7 days a week 2 minutes to plant a tree 20 minutes toilet breaks and 1 hour worth of lunch 8 hours minus 1 hour and 20 minutes = 6 hours 40 minutes 400 minutes per days work divide by the more realistic 2 minutes for the time spent planting 1 tree= 200 trees Divide the number of trees planted per person, 150000, by 200 will give you the days it took for one person to plant the trees. 750 days or 2 years and 1 month

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#34

How Accurate Is This?

How Accurate Is This?

Thats close to correct. The helm is $170, Body armor is $124, Shield is $131, Body pouch is $30, Pepper spray is $16, Mask + Gloves are $70, Baton is $55, Non-lethal is $98, Rubber bullets $60,
Total= $854 per person...
Cover all is $3 {$75.73(with tax) for 25 people}, Mask is $8 {$160 for 20 people}, Face shield $2.70 {$135 for 50 people}, Gloves are $0.30 {$134.76 for 1000 people}, Thr appron is $0.50 {$48.92 for 100 people},
Total = $14.50 per person...
$854(1 person) ÷ 14.50(1 person) = 59.97.....
There are 59.97 (59 or 60) peoples worth of ppe coverage in 1 riot gear.........
Prices may vary state to state

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#35

Haircuts

Haircuts

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Foxxy (The Original)
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Oh boy, those are some awful cuts. The poor person in the second pic has the face of regret.

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#36

How Many Nuggets Would This Be In Total?

How Many Nuggets Would This Be In Total?

2.3 billion nuggets sold per year in America by 375,000 workers, hence each worker makes 613 nugget portions per year. This would mean he served an extra 613 nuggets over the course of one year, hence
1,533 extra nuggets in total.

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#37

The Number Of Plants Needed To Replace The Oxygen You Waste

The Number Of Plants Needed To Replace The Oxygen You Waste

Humans consume anywhere from 20-30 liters of pure oxygen per hour. A leaf will typically give off 5 milliliters (.005L) of oxygen per hour. 20 liters consumed divided by .005 liters produced comes out to 4,000 leaves minimum, which comes out to 80 50-leaf plants.

bthnp Report

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gustavo silva
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Aaand they would invert their breathing cycle during the night, so: 1. watch out for all that CO2; 2. You'd better start producing O2 during the night somehow, to counter their effect.

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#38

Is This Possible?

Is This Possible?

We can try to make some simple Physics computation here. We can use Bernoulli's equation (which is basically just the principle of conservation of energy). In order for this amazing trick to work we need the urine to reach the point of zero (ideally a bit more than zero) velocity at a height higher than the head of a regular dude. Translated into the Bernoulli equation it reads:
0.5v2 > gh => it works => v > sqrt(2gh)
with v the initial velocity of the urine, g the gravitational acceleration (9.81 m.s-2), and h the height from the penis to the top of the head. Now I have measured this height for me and it’s around 1 meter. This means that I would need to pee at 4.4 meter per seconds to pull this off!
This brings us to the interesting question: How fast do we pee? Well, I did not research the depth of internet for this but I found this paper saying that the speed for boys is around 2.35 and 3.25 meter/s. So if it’s the case for me I would totally pee on myself, fail. But if you are a young boy or a dwarf you can make it! 2.35 meter per sec corresponds to 28 cm penis to head.
It might be that women have a higher urine velocity so they may have a chance (if they can aim towards the top which remains to be seen right…).

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wynnegilbert avatar
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

I can unsee the demon hand or something that is in the mirror in the picture

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#39

How Much Money Would Cost 71,000 Vhs?

How Much Money Would Cost 71,000 Vhs?

I'm gonna presume she bought tapes in bulk and made use of any available clearances and discounts. Based solely on this article I found from 1996, it seems that if you looked for a good sale you could get blank tapes at around $2 apiece in 1996, which is about $3.20 in today's money.
Using that as a baseline, it would have been around $230,000 over the years.
I imagine with buying that much she's could probably find somewhere with even cheaper prices, so it could have been even half that, but it's in the ballpark of the price of a house.

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#40

How Many Cigarettes Would It Take?

How Many Cigarettes Would It Take?

Well it depends on when she would die without it. But let's say she has the biological/genetical prerequisites to become 100, based on how old her Mum was when she died, this doesn't even seem too unexpected (I hope I am not jinxing it). She would turn 114 in 2040. So we need to calculate how many cigarettes give her 14 years.
14 years are 7363440 minutes, including leap years. Those are 920430 cigarettes. Almost 1 Million. From 2020 on, smoking 126 cigarettes a day until 2040 would suffice. Those are 6 packs of 21 cigarettes. Oof. While 6 packs are excessive, it could be possible. Assuming he is awake 18 hrs per day, he needs to smoke 7 per hour. Still a lot of work.
Remember that he has to finish not in 2026, as the extra lifetime is not needed completely when she turns 100. Basically finishing a cigarette seconds before she would die would be good enough, she would be alive for 8 more minutes, and he would have 8 minutes to smoke the next one.

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Wolfstar
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Nah, the Queen doesn't need your cigarettes. She be drinking her immortali-tea.

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#41

Swimming In PUBG Is Faster Than Michael Phelps

Swimming In PUBG Is Faster Than Michael Phelps

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#42

How Big Would Ant-Man Need To Grow For This To Work

How Big Would Ant-Man Need To Grow For This To Work

What is the structural integrity of Thanos's butthole compared to Antman's power armor. At least one would die, either by being crushed or ripped apart. If Thanos is the stronger one, Antman's crushed remains will just be extruded once he expands beyond the available space.

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Julius Martin
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

this sounds like something the boys will do, hate thinking about it

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#43

Is This Shoe Size Accurate?

Is This Shoe Size Accurate?

The shoe would be more than 40ft (12m) long so this doesn't appear to be true.
The UK shoes measurements are very close to the US measurements so I didn't bother checking that possibility.

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#44

Powering The World With Solar Panels

Powering The World With Solar Panels

Okay. Worl wide energy consumption is roughly 21 trillion kwh. Solar energy in the Sahara produces 2350kwh per square metre. This means we need a space of roughly 9000 square kilometres. This is roughly 0,1 percent of saharas total space. This checks out with the claim of the creator of this image. So this is accurate but the big problem with that is, that you cant transport this much energy over a wide range.

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M O'Connell
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

So you're saying Algeria could make a killing in the global energy market?

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#45

What Would Be The Speed If It Was Scale Up To Real Horse Size?

What Would Be The Speed If It Was Scale Up To Real Horse Size?

So apparently Woody is 15.18 inches tall without his hat, and Bullseye looks to be just over half that to the shoulder, so I’ll say 8 inches. A quarter horse (as cowboys would’ve ridden) typically stood at 14-2 to 17 hands tall to the shoulder (56 to 68 inches), but even if scaled-up Bullseye is the shortest possible, this scale would make real-person Woody well over nine feet tall. As this seems unlikely, I’ll take scaled-up Bullseye’s height to the shoulder to be 1 metre for convenience, making scaled-up Bullseye 4.92 times bigger than toy Bullseye.
Jet airliners typically take off at speed of 150-177mph (I was going to use a Boeing 767-300F as the plane, but wasn’t able to find a takeoff speed). The plane in the movie takes off not long after Bullseye stops, so I’ll say it was moving at 140mph. Scaled-up Bullseye, therefore, could run at 140*4.92=689mph. For reference, the speed of sound at sea level is 767mph. Transonic horse. How about that.

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Krystian Granatowski
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

uhmmm... no. Air resistance is not linear, it requires 4x the force to travel 2x faster. We also do not know how much force can a scaled up muscle generate (it is 4.92 times longer, but much higher then that in volume)

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#46

How Much Was This Ramen Actually Worth?

How Much Was This Ramen Actually Worth?

This is from a previous post and user u/srappe:
Given a standard 53' trailer:
According to http://www.wbmcguire.com/links/Guides/TruckTrailerGuide.pdf, A 53' trailer has interior dimensions of 47'6" x 98.5" x 107.375" and a capacity of 3,489 cubic feet.
A 24 ct. box of Ramen Noodles has dimensions of 15" x 12" x 12" or a volume of 1.25 cubic feet.
u/Goldencaramel pointed out that I need to take in account for the pallets.
Pallets are 40" x 48" x 5" roughly. If the floor of the trailer has dimensions as listed above, you can fit 14 pallets lengthwise, and 2 width-wise. On the pallet itself, you can stack roughly 3 boxes of Ramen width-wise (40/12 = 3.33), 3 length-wise (48/15 = 3.2), and 4 height wise in order to be able to stack 2 pallets high in the truck (4*12 = 48). This gives the pallet, with the product a height of 53". Given the height of a trailer is 107.375", you can stack two pallets on top of each other with this packing method.
Therefore, you can fit 56 (14 x 2 x 2) pallets, each carrying 36 (3 x 3 x 4) boxes of Ramen into the truck
This means the maximum number of 24 ct. boxes of Ramen you can fit in a 53' trailer with pallets is 2016 (56 x 36)
These boxes sell at ~$12 at my local BJ's which means that the trailer would have a consumer value of about $24,192 (2016 * $12)
Now according to several people, you wouldn't stack pallets containing a product so fragile on top of one another. Also, according to a fellow freight broker, you can only fit 26 pallets in a trailer.
Re-do the math for a more "real-world" cost estimate and you come out to:
2636$12 = $11,232

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#47

How Many Stones Would Real Buzz Need To Use For His Message To Actually Be Seen?

How Many Stones Would Real Buzz Need To Use For His Message To Actually Be Seen?

Assuming a very basic font of 3x5 pixels, the real Buzz can spell HELP in all caps with 7+11+7+10 (35) square pixels’ worth of stones. Double that in each direction so LRO can see it and you have 140 square meters of stones.
Supposing he has access to stones of about half a meter each in diameter, that would be about 560 stones.

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#48

How Much A Retweet Cost

How Much A Retweet Cost

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tiari avatar
Tiari
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

It’s still 0$. It might be some fractions of a cent, but it’s still 0$.

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#49

How Big A Hot Air Balloon Would Need To Be To Hoist A Normal Person Like In The Image?

How Big A Hot Air Balloon Would Need To Be To Hoist A Normal Person Like In The Image?

With air at 100C in the ballon and airdensity normal 1.2kg/m3 And at 100C 0.93 kg/m3
That gets us to 0.27 kg carried by 1 m3 Average human 80kg =ballonsize 80/0.27=296,3 m3
So about 300 cubic meters per person...

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#50

How Many Years Until His Forehead Reaches Space

How Many Years Until His Forehead Reaches Space

Space is 62miles above earth.
62 miles = 3,928,320 inches
In 20 years, his forehead grew 4 inches. That’s .2 inches a year.
It would take 19,641,600 years to reach space.

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#51

Got Banned For Doing The Math On R/Conservative

Got Banned For Doing The Math On R/Conservative

Kryxan Report

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François Carré
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Rule 7 : don't do math. Math is against Conservative's beloved alternate truth.

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#52

How Much Cheese Would This Waitress Have Gone Through?

How Much Cheese Would This Waitress Have Gone Through?

It takes two minutes to grate 227g of cheese. That's 6.81kg of cheese per hour - that is, 88.53kg or 195.18lbs of cheese on Mr. Delanche's plate.

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Becca Gizmo the Squirrel
Community Member
3 years ago DotsCreated by potrace 1.15, written by Peter Selinger 2001-2017

Better tip that waitress, since she had no time to wait on others to get tipped.

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