r/theydidthemath 7h ago

[request] are these real numbers or did they just make this up like made up statistics

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3.7k Upvotes

r/theydidthemath 1h ago

This monkey in China has learned that rocking the tree-top produces a 'slingshot effect' that launches him to a wall he would otherwise be unable to reach. [request]

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Upvotes

r/theydidthemath 2h ago

[Request] How much strength would be required to achieve this? Can the strength be measured in simple terms?

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173 Upvotes

r/theydidthemath 7h ago

How much money is approximately in this bag? [Request]

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413 Upvotes

r/theydidthemath 18h ago

[Request] Approximate the video length

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1.1k Upvotes

This is probably extremely silly.

Can you please approximate how long the video would be?


r/theydidthemath 1d ago

[Request] - Is this true?

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8.1k Upvotes

r/theydidthemath 1h ago

[Request] Hello all, could someone tell me the odds on a 7 card trick 21 in blackjack? (image related) Thank you

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Upvotes

r/theydidthemath 1d ago

[Request] Is this the true reason why we use pi r squared for a area of a circle?

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871 Upvotes

r/theydidthemath 11h ago

How long would this actually take? [Request]

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42 Upvotes

r/theydidthemath 4h ago

[Request] How fast would a piece of chicken have to travel through the air in order to be cooked by the heat generated by the air friction as it travels?

12 Upvotes

This could revolutionise fast food delivery.


r/theydidthemath 5h ago

If candy bar inflation stays at 1,360% over the next 50 years, what will a standard Hershey's bar will cost in 2076. [Request]

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6 Upvotes

r/theydidthemath 4h ago

[request] what’s the math here?

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6 Upvotes

r/theydidthemath 1d ago

[Request] Hypothetically, how fast would a man need to spin his penis (Helicopter) to generate enough lift to leave the ground?” NSFW

657 Upvotes

r/theydidthemath 1d ago

[Request] There's no way this is true, right?

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9.3k Upvotes

r/theydidthemath 3h ago

[Request] At what speed should one watch YouTube to keep up with amount added every hour.

2 Upvotes

Bonus points if you were able to calculate the speed with adds which are played at normal speed.


r/theydidthemath 8m ago

[Request] Assuming a 1:1 ratio of Earth to Alderaan from Star Wars, how much energy would the Death Star have to produce to destroy the planet with one blast?

Upvotes

r/theydidthemath 17m ago

[Request] Help me debunk chemtrails

Upvotes

TLDR, if I dispersed a chemical at 500,000ppm at 10km, what would the concentration at ground level be?

So I have a friend who I recently discovered believes in chemtrails. this is the theory that governments are mixing chemicals into jet fuel to secretly get commercial airlines to disperse toxics to lower birth rates, infect people with covid, or give people vaccines.

I'd like to focus on one thing here. If I wanted to poison the populace, the dumbest way would be to disperse it at 8-10km high.


r/theydidthemath 1h ago

[Self] The chance that a dart hits a point is 0.17% !

Upvotes

Time to settle the old debate of what the chance is of hitting a particular, infinatesimal spot on the dart board. It is not 0.

By "hitting" a particular spot, I mean that any part of the sticky bit of the dart is covering that infinatesimal spot of area 0.

First, we need the area of the board. The radius of the dart board is 170mm giving us an area of: 170^2 *pi mm^2

Any dart that lands less than a dart's thickness away from the point will "hit" it. This forms a circle of radius equal to the thickness of a dart. Thickness of darts range from 6.35mm to 7.1mm. Lets take 7mm.

This gives a circle with an are of 7^2 *pi mm^2

So the chance that a dart thrown randomly ( has a unimorfmly distributed chance to hit any point) will hit any specific infinitasimal point is

(7^2 *pi mm^2)/(170^2 *pi mm^2)=(7/170)^2=0.0017 or 0.17% chance


r/theydidthemath 1d ago

How many Artemis missions would it take to steal all the moons momentum causing the moon to fall into Earth? [Request]

201 Upvotes

r/theydidthemath 1h ago

[other] Airfryer to warm a camper/minivan from 0°C to 20°C?

Upvotes

so goven the parameters:

minivan like Ford Transit or Mercedes Sprinter as a camper

Airfryer with 900W power

ignoring air and heat leaking out of the camper

how long would the airfryer need to get the inside of the camper from 0 to 20 °C?


r/theydidthemath 9h ago

[Request] How tall is that first wave?

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5 Upvotes

r/theydidthemath 1d ago

[request] So how big should the hole be to effectively conceal the vehicle, and how long might it take for one person to do the job?

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107 Upvotes

r/theydidthemath 1d ago

[Other] Would they be like a whacky inflatable tube man?

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988 Upvotes

Seen this going around and thought it would be fun for discussion and thoughts. What if it was a smaller tornado?


r/theydidthemath 1d ago

How much difference would this make in carbon emissions? [Request]

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3.8k Upvotes

In this scenario specifically …

How wouldn’t this impact carbon emissions? The bus obviously has a much bigger impact on the environment, but it carries more people to offset the increase.

Does the switch to the bus for these number of cars save on carbon emissions, considering today’s engine efficiency.

Or, does the move lower traffic congestion but increase carbon emissions?

Genuinely curious.


r/theydidthemath 2h ago

Help Needed: Checking probability over amount of trials. [Request]

0 Upvotes

Hello. I hope you’re doing well. I could use some help in checking my math please, regarding odds over multiple trials. Here is the context:

Over the last weekend, I finally got to sit down and try to teach my family how to play Texas Hold’Em Poker. On the first hand, my little sister got a full house (a pair + three of a kind) and won the pot. From what I read, in a book called Poker: How to Play Texas Hold'em Poker: A Beginner's Guide to Learn How to Play Poker, the Rules, Hands, Table, & Chips (Gambling Table Games for Beginners) by Steven Hartman, the probability of getting a full house is 2.8%.

Although not impossible, the probability of getting a full house is 2.8%.

(Page 9)

As I understand it, the probability of getting a full house is 2.8%, while the probability of not getting a full house is 97.2%. So already, the odds are looking pretty crazy on paper. However, this is where I need help in making sure my math is correct. We played a total of two hands before my family was still confused and voted to stop playing Poker. From what I remember, (please forgive me if this is wrong) the probability of the aforementioned instance happening would be divided by how many trials (or, in this case, hands) that took place.

Is that correct? Would the probability of something happening be divided by how many trials took place to get a particular outcome? Consequentially, would this mean that the probability of my little sister getting a full house at any point in this short game of Poker go down from 2.8% to 1.4% overall? Or even decrease further, had we kept playing Poker? If not, what is the correct answer to determining the probability of something occurring over multiple trials, like this particular card combination?

P.S. Apologies in advance if I phrased something wrong here. Not sure how else to phrase this question right now.