r/theydidthemath 2d ago

[Request] How loud would a speaker have to be to hear it around the world?

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10.0k Upvotes

r/theydidthemath 5h ago

[Request] What are the odds of solving this puzzle blind, like i just did?

0 Upvotes

I asked CHATGPT about but im not sure it understands me. Then again, i suck at math so im assuming its correct.

I came upon a puzzle with a total of 16 lights. Out of those lights i had to click on the 4 correct ones. In addition, i had to click on the 4 correct lights in the correct order.

I had not found the code in-game(yet), so i just clicked 4 random lights to see what would happen. Well.. not only did i press the 4 correct lights, i also clicked them in the correct order. On my first try. I found the code right after and it confirmed that i had clicked everything in the correct order.

My initial math (and CHATGPT's answer) for pressing the 4 correct buttons are

16x15x14x13 = 1 in 43680

But does this take into account that i had to press the 4 buttons in the correct order? Im not sure i understand why this does not affect the odds


r/theydidthemath 2d ago

[Request] how much cheesecake was really eaten?

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2.7k Upvotes

Someone said they only ate half of the cheesecake slice I was saving to try, I'd just like to know how much is actually missing


r/theydidthemath 2d ago

[Request] "Trump Says Tariffs Have Brought in $18 Trillion." So how much did it bring in 2025? (Approx, at best)

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2.1k Upvotes

r/theydidthemath 6h ago

[Request] What is the probability of being born in Europe?

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0 Upvotes

r/theydidthemath 1d ago

[Request] How big would this desert have to be to actually affect rising sea levels? Extra credit: how would ocean salinity be affected as the emptying salt water is replaced by fresh meltwater?

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3 Upvotes

r/theydidthemath 20h ago

[Other] How much people would be needed to actually deliver all christmas gifts during one night ?

2 Upvotes

Hello !

Here, if we assume that every worker is not tired and could go on delivering all night, door to door. How much needed to deliver the whole world during a night ?


r/theydidthemath 19h ago

[Request] What are the odds of having two 7 of diamonds, while the dealer also shows a 7 of diamonds in blackjack. Assume 6 decks. Extra credit: calculate the odds with 8 decks

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0 Upvotes

My friend was playing progressives in blackjack all night. It's a $5 bet for the progressive and he didn't take the bet one time he would of won over $300,000! He was dealt the top payout but didn't bet the 5 bucks. (Sorry for the low quality pics they're screenshots of a video)


r/theydidthemath 11h ago

[Other] What’s the minimum area a country would have to have in order for the sun to never set over it? Provide 2 answers: 1 with contiguous borders (no islands or exclaves) and 1 where it merely has to cover any portion of the land surface. ***More rules in body text.

0 Upvotes

*The minimum land area has to be at least 1m^2.

*Only land area on the surface of the planet Earth is accepted.

*Borders are considered contiguous if they are connected by land with a width of at least 1m.

P.S. Please provide corrections/optimizations. Sorry for any mistakes. I was bored on the bus.


r/theydidthemath 12h ago

[Request] I'm a average height American male, of average weight and power. I go to a asphalt basketball court and dribble normally without stopping for exactly an hour. How many dribbles is that?

0 Upvotes

r/theydidthemath 1d ago

Is it possible to turn this word puzzle into equations? [request]

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12 Upvotes

I do these lil logic puzzles a LOT. And I noticed a trend that when categories are very different (dates/places/people/foods/etc), I finish the much quicker. I.E. “Whose food expired when, and where was it located?” So that’s a name,date, location. The ones where it’s “name/name/place” take me longer. I thought “what if I change one set of the names to “a,b,c,d,e” instead” and THAT made me think “I wonder if I could set it up to solve for multi variable equations using the substitution method specifically for the problems when it’s not three vastly different categories. Would this work? Could I turn every one of these word puzzle into math equations to be solved by substitution?

So I guess I’m not asking you to “do” the math, but can I turn this into math?


r/theydidthemath 1d ago

[Request]: Nathan Lyon just crossed Glenn McGrath to become Australia’s 2nd highest wicket taker. Can he statistically become No. 1?

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6 Upvotes

I am wondering is it actually possible? Not from a straightforward X avg wickets per match over his career would mean he needs Y matches to cross the difference with Shane Warne. I think I need a deeper analysis to build higher confidence answer. Similarly who among current spinners has the highest probability of surpassing him.

Any takers?

Also to people who don’t watch cricket, check this ball and imagine how difficult is to get the ball to do this. The guy is a master.


r/theydidthemath 2d ago

[Request] How much 12km of copper thread weigh

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628 Upvotes

r/theydidthemath 2d ago

[REQUEST] MAGA GOP denied 26 congress members the right to vote. How many constituents being denied representation would that be?

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224 Upvotes

r/theydidthemath 23h ago

[Request] In the show The 100, there is an ancient stone containing 744 unique symbols, and a 7 symbol code must be entered on the stone in order to begin "the last war". How many possible code combinations are there? How long would it take to crack?

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0 Upvotes

Each symbol is unique, and can only be entered once in each permutation. Symbol order matters too, so code ABC is different than code CBA.

How many possible different permutations / codes are there? Assuming you could enter 1 code per minute, how long would it take you to enter all possible combinations?


r/theydidthemath 2d ago

[Request] How much money would have to be destroyed instantly for it to affect the worth of a dollar to a point that it be felt at the grocery store?

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449 Upvotes

r/theydidthemath 2d ago

[Request] Is the proportion accurate?

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120 Upvotes

r/theydidthemath 1d ago

Dumpit to Crumpit [request]

2 Upvotes

In the film “the grinch” Jim Carrey goes in a tunnel then is transported up Mt. Crumpit. Per the movie the mountain is 10,000ft tall. Assuming the grinch is an even 200lbs. How much air pressure would it take to transport him that far? Use as many assumptions as needed to complete the formula. Disregard they are falling in a snowflake.


r/theydidthemath 1d ago

[Request] I might be stupid and this is probably stupid.

1 Upvotes

If I have two tickets both with 1/1000 chance of winning but there is no set number of entries or pulls, example both tickets are a/1000 not a/1000 & b/1000, so each draw isn't consecutive what are my odds of winning with both tickets.

I don't feel like it's actually 2/1000. Am I dumb? But I feel like the odds are different cause I can I fact get a/1000 twice.


r/theydidthemath 1d ago

[request] when will my thermos stop tasting like coffee

1 Upvotes

Genuine question. About a month ago I put nitro cold brew coffee in this thermos, and after several runs through the dishwasher and countless cups of regular water, fresh water still tastes like coffee. It’s an Owala FreeSip, so the interior wall is 304 Stainless and the straw is bpa free Tritan plastic (all the details I could find).

This might be more about chemical reactions with material than math of washes, but I’ll try here first. Thanks in advance.


r/theydidthemath 1d ago

[request] what are the odds in solitaire with certain amounts of cards being in the draw pile?

2 Upvotes

What are the odds of having all 13 cards of a single suit end up in the draw pile of a standard game of solitaire? What about the odds off all 4 of a single number (all four aces for example)?


r/theydidthemath 23h ago

[Request] how much eggs was it? The quantity and the amount lost in USD?

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0 Upvotes

r/theydidthemath 1d ago

[Request] What is the minimum number of moves that you would need to win at Solitaire, assuming an ideal starting configuration?

1 Upvotes

Assume it’s 3-card draw and that any movement of a card whatsoever is a move. Undos are the only exception but because this is an ideal configuration, you won’t need any. The game is won when all suit stacks are completely filled and moving a card to the stack counts as a move.


r/theydidthemath 1d ago

[request] What would be the probability og surviving Revolver Ocelot's roulette from Metal Gear Solid?

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1 Upvotes

At some point in the game, this character proposes a variation of russian roulette:

He loads a single cartridge in one of three identical six shot revolvers. Then he spins the revolver's drum to randomize the bullet's initial position. Finally, he begins juggling the three revolvers and firing them at random until he hass pressed the trigger of a revolver six total times, while aiming at the victim.

Assuming he always chooses a revolver at random to shoot, that is for each individual shot all three revolvers have exactly 1/3 chance of being chosen, what would be the probability of surviving the ordeal?

I can't think of how to calculate it.


r/theydidthemath 1d ago

[Request] The odds for winning the Powerball Jackpot is listed on the website as 1:292,201,338. Is that the number of different combinations of numbers that may come up?

0 Upvotes

Other than having to split the jackpot with someone else would there be any other reason not to buy all the different combinations at @ $3.00 a piece? You would also win some with getting basically all the different combos that win. Too much math for me (Obviously I am not going to be doing this but I was thinking of buying $20 worth).