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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
-2
votes
2 answers

How many integers $(n)$ are there where $n + 30$ is a multiple of $2n$?

I tried to write an equation for the problem but really got stuck with something like $n + 30 = 2n × x$
Thesus
  • 11
-2
votes
1 answer

find the treasure.

Guys I just started college ( engineering) so if this question was easy just help me out please. There are three boxes,and three messages: Message 1 / box 1: the treasure is not in the box 1. Message 2 /box 2: the treasure is not in the box…
Kristi
  • 15
-2
votes
1 answer

Sudoku Conjecture about rows and columns

In the game of Sudoku, if all the columns and rows are properly filled, will that assure all the boxes will be properly filled?
William Elliot
  • 17,598
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votes
1 answer

what is the logic and the answer

here is one question my friend sent me. What can be the last two numbers' answers and can you also tell the logic, thanks 4072=1 3489=3 6517=1 9682=4 7678=3 1020=2 9345=? 9807=?
user3389920
  • 3
-2
votes
2 answers

Riddle: which is the next bigger number?

How to solve this puzzle? Follow this link
Ameer Hamza
  • 157
-3
votes
2 answers

Find the last number in the given sequence

Find the last number in the given sequence $$\begin{pmatrix} 4& 9& 20\\ 8& 5& 14\\ 10& 3& ?\end{pmatrix}$$ (It's $3\times3$ matrix)
Dimitar Tsonev
  • 183
-3
votes
1 answer

birds and cages

We have a number of birds and we bought cages to put them in. If we put $7$ birds in each cage then one bird is left over. If we put $9$ birds in each cage then one cage is left over. Find the number of birds and cages. Any ideas or hints?
Paris Lamp
  • 578
-3
votes
2 answers

Find the missing dollar

Three friends eat at a restaurant and finally ask for the bill. They pay the 75 dollars by dividing it equally (so they spend 25 dollars per person.) The waiter takes the money to the owner, who, in a generous mood, offers a 5 dollar discount. But…
theVerma
  • 49
-4
votes
1 answer

Fisher puzzle with 4 fishers

Four people went fishing one day. They put all the fish in one basket. Then they left for a rest. When the first person came back, they divided the fish into four equal parts with one fish left over. They threw away that one, and left with their…
איתמר זידמן
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