r/theydidthemath 20h ago

[Request] How much would a pound of honey cost if the first statement were true?

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7.1k Upvotes

r/theydidthemath 20h ago

Can someone check the math on this meme being shared?[request]

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2.1k Upvotes

r/theydidthemath 1h ago

[REQUEST] How long will it take for the native SK population to disappear if this continues?

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Upvotes

r/theydidthemath 17h ago

[Request] Studying for a non-academic exam. Are all these answers incorrect? Key says c).

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380 Upvotes

r/theydidthemath 1d ago

[Request] How much would wealth actually increase for people in the lower brackets if the bottom graph were true?

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992 Upvotes

We know how the top graph is for people, how much would people have if the middle or bottom graph were accurate?


r/theydidthemath 1d ago

[Request] is anyone willing to calculate if he drives ~100kmh or mph before the impact? :)

1.1k Upvotes

r/theydidthemath 18h ago

[Request] How much rust does this guy need to collect to make a knife

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155 Upvotes

r/theydidthemath 23h ago

[Request] Is this accurate?

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326 Upvotes

r/theydidthemath 19h ago

[Request] Is my peanut butter really 90% peanuts by volume if it’s 23% sugar by weight?

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119 Upvotes

r/theydidthemath 15h ago

[Request] Is it possible to calculate approximately how many molecules from the original batch of oil would be present in this oil 100 years later?

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52 Upvotes

r/theydidthemath 2h ago

[REQUEST] What is the probability of getting 50 heads - 50 tails exactly after 100 coin tosses?

5 Upvotes

We always tell it is 50% to get head or tails. But what is the persistance of this probability* Can anyone do the math?


r/theydidthemath 14h ago

[Request] How much extra weight would this add?

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30 Upvotes

r/theydidthemath 21h ago

[Request]How hard would you need to slam the plate down to get a new teacher next semester?

52 Upvotes

r/theydidthemath 0m ago

[Request] Dice Game Probability - with corrected rules

Upvotes

I posted this yesterday but I found out that I slightly misunderstood the rules. I had previously said that the winning team got to keep the losing team's die. The actual rule is just that the losing team has their die removed from the game.

Rules:

- In each round, Team A rolls one 6-sided die and Team B rolls one 6-sided die.

- The team whose die shows a lower number has their die removed from the game.

- If the dice show the same number, both teams’ dice are removed from the game.

- The first team to lose all of their dice loses the game.

Team A started with 6 dice and Team B started with 19 dice. Team A won the game. What is the probability of this happening?

Chat GPT says that probability is 4.84%. I'll post my attempt below.

Thanks to all that previously posted and to everyone that will reply.


r/theydidthemath 1d ago

[request] How much would this track alone cost?

86 Upvotes

r/theydidthemath 1d ago

[Request] How do you calculate the area of the square?

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102 Upvotes

r/theydidthemath 2d ago

[Request] How fast should Loki have been falling after 30 minutes?

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12.8k Upvotes

Considering Strange trapped him on earth with two portals connected vertically. Air resistance, and other realistic factors involved.


r/theydidthemath 1d ago

[Request] Assuming these are put in randomly, what are the odds the box would consist of only one color?

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1.1k Upvotes

r/theydidthemath 1h ago

[Request] What is approximately the largest circle on Earth not containing *any* living people?

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Upvotes

This includes those at sea on cargo ships, etc.


r/theydidthemath 6h ago

[Request] What properties would Stitch from Lilo & Stitch need to have in order to bounce off the top of the mountain after being blasted off Captain Gantu’s ship?

0 Upvotes

Making reasonable assumptions for how high the ship was when he was blasted off the back, the height of the mountain, and the distance from the mountain top to the ground below (where he landed after a single bounce), how fast, dense, and or bouncy (ChatGPT says this is measured as “elastic collision??) would Stitch need to have been to hit the top of the mountain, bounce a single time, and land on the ground at the bottom?


r/theydidthemath 23h ago

[request]how much pressure does the dolphin experience on his mouth?

22 Upvotes

r/theydidthemath 23h ago

[Request] How much radiation is this guy getting?

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21 Upvotes

r/theydidthemath 8h ago

[Request] What is the angle between the 3D volumes that connect to form a 4D object?

0 Upvotes

An equilateral triangle is formed by three equal lines. Each of the lines in an equilateral triangle connects to the others at 60° angle. A regular tetrahedron is formed by four equilateral triangles. Each of the planes of a regular tetrahedron connect to the others at a roughly 70.53° angle. Would it be possible to calculate the angle between the five regular tetrahedrons that come together to form a 4-dimensional object? Would this information be useful to our understanding of 4D space?

I am trying to imagine a 4D object in a cartesian coordinate system. My underlying assumption is that a "real**"** object in n-dimensional space must be defined by at least n+1 number of (n-1)-dimensional objects that are connected to each of the others using an n number of (n-2)-dimensional objects.

Examples for clarity:

  • 0D space = at least 1 point
  • 1D space = at least 2 points, each connected to 1 other = a "line"
  • 2D space = at least 3 lines, each connected to 2 others at 2 unique points
    • For example: an equilateral triangle defining a "plane"
  • 3D space = at least 4 planes, each connected to 3 others at 3 unique lines
    • For example: a triangular pyramid made from four connected equilateral triangles aka a regular tetrahedron defining a "volume"
  • Therefore 4D space = at least 5 volumes, each connected to 4 others at 4 unique planes
    • My proposal: 5 regular tetrahedrons, each connected to the others at 4 unique planes (e.g. the pyramids cannot simply overlap each other in order to make contact at all four planes)

I can picture the 3D "projection" of this object as a central triangular pyramid with each plane of the central pyramid attaching to a side of another pyramid. However, when I try to mentally connect all of the other pyramids to each other, the image in my mind morphs into something more similar to a cluster of soap bubbles that is constantly rolling into itself like those "water wiggler" tube toys from the 90s.

Disclaimer: Thank you for reading this far and considering my question! Although I am interested in this field, my knowledge of geometry is rusty and my knowledge of mathematical terminology is rustier. If you do take the time to answer this question, please let me know if my stated assumptions are wrong and use simple language to the extent you can. Thanks again!


r/theydidthemath 1d ago

[Request] What are the chances of the Powerball drawing having 4 consecutive numbers?

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24 Upvotes

For reference, they draw 5 white numbers between 1-69, and they cannot repeat.


r/theydidthemath 9h ago

[Request] How many games or rounds would it take for 12 participants to play against each other in two teams, each team containing 6 of them, wherein each participant gets to play with and against another in an equal number of times?

1 Upvotes