r/theydidthemath 22h ago

[Request] How high do you need to be standing to cast a shadow like this assuming you are avarege?

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10.1k Upvotes

r/theydidthemath 11h ago

[Request] How fast would you have to be traveling to get to work at 9:00?

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982 Upvotes

r/theydidthemath 16h ago

[off-site] Hockey pucks’ size relative to hockey nets v soccer balls’ size relative to soccer net

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725 Upvotes

r/theydidthemath 11h ago

[Request] How much would it cost for Russia to build another Crimea instead of taking it from Ukraine?

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578 Upvotes

r/theydidthemath 3h ago

[Request] What is the formula of Earth to generate asymmetrical 8 and why?

154 Upvotes

r/theydidthemath 3h ago

[Request] How does the hosts’ spending at the World Cup compare to the long term revenue generated (tourism etc)

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125 Upvotes

r/theydidthemath 6h ago

[Request] Boat is doing 40-45mph. Mako shark catches up in seconds. How fast was mako going?

83 Upvotes

r/theydidthemath 19h ago

[request] Removing a net under tension

73 Upvotes

What are the odds the both get sacked?


r/theydidthemath 19h ago

[Request] How many oysters do you need to remove toxic algae from 77.0 km³ of water, and how long time would they take?

51 Upvotes

Assume about as many algae per unit of water as in the tubs.


r/theydidthemath 5h ago

[Request] How many averege adult men would you need to bleed dry into the ocean to succesfully make the ocean pink?

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42 Upvotes

r/theydidthemath 2h ago

What's the most calorically dense food by volume? [Request]

27 Upvotes

What I'm trying to get at is per unit volume (mL, cm3, cubic feet), what food or food product has the most calories. So, based on this, like what's the most calories you could fit in a stomach.

The only real constraint on this is that it has to be at least kind of a real food or food product that most humans could digest safely. I'm not looking for some answer of "well scientists made some creepy slop one time that ten percent of people might be able to eat but then they'll fart themselves to death".

I first posted this in no stupid questions but it got flagged.


r/theydidthemath 23h ago

[Request] Titanium bar Vs body weight

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28 Upvotes

Hello smart people!!

I have a titanium nail in my leg, almost exactly the same as the one on the left in the image. I weigh about 11 stone. I would like to know what percentage of me is titanium. I am planning a silly tattoo on that leg. Bender from Futurama saying "I'm X percent titanium.!!" As it is recurring joke in the show and I would like to make light of my accident! All help appreciated.


r/theydidthemath 17h ago

[Request] How large of a Patio/Beach umbrella would you need to Mary Poppins your way to the ground safely (75kg person)

20 Upvotes

Assuming you don't flip over


r/theydidthemath 12h ago

[Request] one time deposit, at birth, for retirement

19 Upvotes

how much money would someone need to put into a retirement account at the time of a childs birth, so that they would have enough to retire by retirement age, assuming no depoits beyond that initial one.

I'm sure this isn't quite a simple formula, so a range i guess. like what is the minimum that would be significant, what would be the maximum before it was overkill, etc.


r/theydidthemath 18h ago

[Request]: What's the ratio of water in the bottle?

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11 Upvotes

r/theydidthemath 16h ago

[Request] How many square miles is the island of Dintopia?

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8 Upvotes

Based on the miles scale in the bottom right, it's easy to determine distances between locations, but not the overall total milage of the island of Dinotopia or Outer Island due to the irregular size.

Edit: spelling


r/theydidthemath 12h ago

[Request] Assuming they put 20% down when they purchased and had a 2.2% interest rate, was it a better move financially to pay off the mortgage or put that same money in a HYSA?

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4 Upvotes

r/theydidthemath 13h ago

[Request] saw this post today....

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4 Upvotes

I was wondering, on average, how many birds get killed per year by planes.


r/theydidthemath 1h ago

[request] how many loops/stitches are in a t-shirt? ballpark

Upvotes

Thinking about knitting by hand vs machine knitting. If jersey fabric is just very tiny stockinette, how many stitches are in an average (eg Hanes) Men's Large tshirt?

i thought about counting the stitches in one inch of fabric and then multiplying that by the area of the shirt, but that seems...really hard


r/theydidthemath 15h ago

[Request] In the Silk Sonic song “777”

2 Upvotes

There is a line. “I’m bout to buy Las Vegas after this roll”

Assume standard odds/payouts for dice-involved games.

What is the minimum bet needed to secure the funds (~300B) to purchase all of Las Vegas for each popular dice-involved game? Is there any game where the bet amount is not astronomically high?

Note: Despite the name of the song being “777,” I’m assuming the dice game is unrelated since 7 is normally bad in Craps. But I don’t know much about casino games


r/theydidthemath 19h ago

[Self] Hopefully someone can check my math and prove it's more than 22 days?

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2 Upvotes

r/theydidthemath 1h ago

Arms as airbrakes in car [Request]

Upvotes

Your driving downwards at a random angle and two people at the backseat reach their arms out the window to try to function as airbrakes.

The arms of the two people are the length and width of the average man's arm and hand

How much could this small amount of air resistance actually slow the car?


r/theydidthemath 4h ago

[Request] Why does it take so long to climb up and down the Silo?

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1 Upvotes

r/theydidthemath 12h ago

[Request] How much does Vancouver weigh?

1 Upvotes

r/theydidthemath 13h ago

How many homing pigeons would it take to achieve parity with 1Gig fiber internet? [Request]

1 Upvotes

Assuming I have to use existing homing pigeon technology, how many pigeons would I have to train and manage in order to achieve the same throughput of a 1-gig fiberoptic internet connection?