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Questions tagged [puzzle]

For questions about the mathematical principles behind puzzle, games, riddles, or their possible solutions. Questions that are not strictly mathematical in nature should be asked on Puzzling Stack Exchange.

Many puzzles, games, and riddles are based on mathematical concepts. This tag is for questions that ask about the mathematics behind a puzzle, game, or riddle, or about the solutions to mathematical puzzles.

If you already know the answer to the puzzle you are posting, you might consider posting your question on Puzzling Stack Exchange, instead. If you do end up posting your question on Mathematics Stack Exchange (MSE), please read the following meta posts on these kinds of questions before asking your question:

If you do end up posting on MSE, please make it clear in your question that you are "puzzling" the community and that you will be answer the question yourself if no one in the community posts your desired solution.

3301 questions
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Nontechnical Proof of “Puzzle on coins: Designing an operation”

Previously asked: A square table has a coin at each corner. Design an execution sequence, each of whose steps consists of one of the following operations: ONE (O): The operation (randomly) chooses a coin and flips it. SIDE (S): The operation…
blackened
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Verbal Reasoning (Puzzle)

There are four persons A, B, C and D. The total amount of money with A and B together is equal to the total amount of money with C and D together. But the total amount of money with B and D together is more than the amount of money with A and C…
Vibhu
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Rectangles in a figure

I have this figure and I have to find $5$ rectangles (which includes squares). I just see four. Where is the $5^{th}$ rectangle?
LP0
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Counting length of pyramid's sides puzzle

I have four blocks, the first block of length two, the second of length three, the third of length four and the fourth of length five, and I can arrange them in the following way: I am allowed to move all the blocks sideways as long as there is no…
GuPe
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How do you calculate 45 min without any clock and sense of time?

There is two non uniform,unequal ropes. Every thing like weight,length etc are not same. But one thing is same. Each one is burned down within 1 hour. I'm giving you these two ropes and a candle just for the fire. So tell me How do you calculate 45…
Sayantan Koley
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Progressive Matrices Puzzle

I have this mind puzzle which has bothered me the latest days. QUESTION: CHOOSE ANSWER: . I realize that there are relations (rotation and translation) between three pairs of the matrices (1-4, 3-5, 6-7), but for two of them (2 and 8) I see no…
nize
  • 113
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How to count jigsaw puzzle height and width in pieces.

How can I calculate jigsaw puzzle dimensions (height & width) in puzzle pieces? I have a puzzle which consist of $3,000$ pieces (the paper inside the box says that because of technical reasons the actual size of puzzle differ from what is printed…
halofourteen
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how many days at work?

There are scheduled buses traveling between Somewhere and Nowhere. There is only one road between the two villages, so the buses take this road. From both villages the buses leave for the other village at every hour and at every half an hour, and…
Epa
  • 259
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Sand-Timer egg boiling

You need to boil an egg. For this task you have to following items: An egg. a pot, filled with boiling water a spoon (to take the egg in and out of the pot) Two Sand-Timers (with amount of time as explained below) In all the parts below, assume…
yossico
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A mental question

We are given a rectangle whose perimeter and area are equal. We have to find their length and breadth.(Both length and breadth should differ). I solved the question via hit and trial method and got the answer 6&3, but I want to know if the question…
Ravindra Sahay
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What is the number on the card that Person 2 has?

I came upon a question that I was struggling on. The question is: A teacher has five cards, labelled 1,2,3,4,5. The teacher then takes two cards from the five cards, a gives them to two people. The teacher then asks the first person: Is your card…
Stevo
  • 241
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Puzzle/Logic Question

Harry, Emily, Grace, and Rohit each have a pet, and have picked a unique number from 1 to 4. Using the following clues, match each person with their pet and number. (a) Emily owns the cat or the dog. (b) Grace owns the Lizard. (c) The bird owner…
user750949
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1 answer

Problems modeling logical

I am having problems solving the following logical problem: In a competition, 5 athletes meet to determine the champion, including A, B, C, D, E. In order to distinguish the winning or losing, they play each pair in an unlimited time. The champion…
Hải Phú Vũ
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Math riddle about 4 cups

There are 4 cups filled till half. In 2 cups there are one drink and in other 2 another drink. They are placed randomly on a table. How to drink half cup of each drink?
idiotas000
  • 13
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Finding the Shortest Path passing through all Routes

I'm wondering if there's actually an easy technique (other than trial & error) to find the shortest path (which covers all paths). I googled and discovered that all paths in this diagram cannot be passed only exactly once based on the Euler Theory…
user672518
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