Mathematics Stack Exchange
Mathematics Stack Exchange

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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How much refund is due? tricky one!

A person moves into a property on 9th Sep 2015 for a rent of £1300 per month. He pays money on 9th of each month. he vacates property on 5th of September 2018. As he had paid £1300 on 9th August 2018, he has overpaid his rent. There are two…
Chaos
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1 answer

cracking a word code

edited my word code -- Of course everyone may boo this problem saying its not math enough and more of a 'riddle me this' type question. But I think it's math very much so as I got as far as to eliminate the letters from ones not in common with the…
Randin
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2 answers

Which figure is the odd one out?

I'm not sure if I should ask this question here, and under which tag so feel free to re-tag or redirect me to another site. Anyway, which figure is the odd one out?
Burrrrb
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1 answer

How do I fill this very challenging table?

I am practicing for a very hard logic competition in Lebanon and I was asked two questions. Complete the following table: Who am I? Can anyone give me a hint? I really have no idea how to start! I tried to fill in blanks by using the sum,…
Online User
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2 answers

Crack the code using the clues

Can anyone Crack this code by elaborating the clues Ans;042
Aryabhatta
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4 answers

How to make four $6$'s equal to $9$?

$$6~~~~6~~~~6~~~~6 = 1 \Rightarrow \frac{6}{6} \cdot \frac{6}{6} = 1$$ $$6~~~~6~~~~6~~~~6 = 2 \Rightarrow \frac{6}{6} + \frac{6}{6} = 2$$ $$6~~~~6~~~~6~~~~6 = 3 \Rightarrow\frac{6+6+6}{6} = 3$$ $$ \cdots$$ $$6~~~~6~~~~6~~~~6 = 10 \Rightarrow…
Gilbert Chiang
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3 answers

I imagined splitting a powerbill was easy...

Hi guys sorry if there is a really easy way to do this... Our flat got a powerbill and wants to break it up evenly.. The bill is over a 61 day period and the total amount is $343.31 There are six flat occupants. Occupants A and B were there for 27…
Will
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3 answers

How old is the captain and ship?

At the time the ship was as old as the captain is now, the captain was twice as old as the ship. Together they are 56 years old. How old is the captain and ship? I've figured out the answer, but I did this through trial and error basically. An…
Kalle B
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5 answers

A puzzle regarding marks!

In a exam there are 50 questions. +1 for correct, -1/3 for incorrect and -1/6 for unattempting. Sarah scored 32 in that exam. Find the minimum number of questions she must have done wrong. How can I approach this question?
bandit_king28
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1 answer

How many of the three natives are bears and how many are packers?

In a certain mythical community, Bears always lie and Packers always tell the truth. A stranger meets three natives And asks the first if he is a bear. The first native answers the question. The second native reports that the first native denied…
Jay
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1 answer

Is it possible that a person will finds the number what his friend thinks in my mind. the number should between 1-100 via java code

the person will think a number between 1-100. The Questionnaire can ask n number of condition, i.e the number is even or odd, the number is perfect square or prime number, sum of squares etc.
praveen
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3 answers

Logic: Door to million dollars

You approach two doors. There are two men. Each man stands in front of one door. Through one door you will win one million dollars. Through the other they will take one million dollars off you. One man always tells the truth. The other always lies.…
Cloud
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1 answer

Which number will replace the question mark in the following sequence of diagrams?

As shown above, I need to guess what goes through the ?-part. I tried number patterns, division, and all but I can't seem to solve it.
Phaya Naga
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1 answer

Pescatarians vs libertarians maths puzzle

The puzzle goes something like this In the US every 13th libertarian is a pescatarian and every 11th pescatarian is a libertarian. Are there more libertarians or pescatarians? The obvious answer seems incorrect to me, yet I don’t know how to go…
pppnpp
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1 answer

Puzzle asked in Interview

There are 2 hour-glasses given to you which measures 3 and 7 hours respectively. You have to measure exactly 8 continuos hours using them. I know that the solution exists for measuring 9 hours. I want to know is there a solution for 8 hours.
Ravi Maurya
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