Math Riddles
Guidelines
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Riddles, not homework. This community is for people to share math problems that they think others would enjoy solving. It is not intended for helping students with homework problems or explaining mathematical concepts. Posting riddles which you do not know the answer to is permitted.
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Harder than trivial. While math riddles of any difficulty are welcomed, please avoid posing problems whose solution is formulaic and/or trivial.
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Spoiler your answers. The intent here is to let others engage in discussion without giving the answer away. It's fun to think about it, and choose when you need a hint!
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Text & image focus. The purpose of this community is for its members to try and solve it themselves. Video links are only accepted when they present the question but no solution. If they include a solution, feel free to post the riddle as text and to include a link to your source.
Code of Conduct
For now, code of conduct shall simply follow the official CoC from the Lemmy organization: Link
Some highlights:
- Remarks that violate the Lemmy standards of conduct, including hateful, hurtful, oppressive, or exclusionary remarks, are not allowed. (Cursing is allowed, but never targeting another user, and never in a hateful manner.)
- Remarks that moderators find inappropriate, whether listed in the code of conduct or not, are also not allowed.
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Fold both ropes to find 5/12ths of each length of rope. Cut off those lengths and burn both of the 5/12 portions? Sounds like it'd work.
Burn the four portions cut this way from the ropes, starting to burn them simultaneously. The 5/12 should be taken starting from the end of the ropes. When the second of these four pieces has burnt fully, say it's approx 25 min.