# Tagged Questions

This tag is meant for questions about the mathematical principles behind games, riddles, or their possible solutions. If the answer is known to you please do not use this tag to "riddle" other users, but rather to ask about the correctness of a possible solution or ways to extend and improve an ...

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### Finding formula [on hold]

X Y Z Answer 8 2 4 0.5 8 2 2 0 8 2 8 1 My professor gave this as a sort of riddle to figure out, and it's ...
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### infinite square grid of resistors

Given an infinite, 2-d, square grid of 1 Ohm resistors, what is the resistance between two adjacent nodes? (Something like a very large window screen, where the wires have finite resistance, but no ...
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### Next number in the sequence 19, 10,11, 18, 38,? [on hold]

What is the next number in the sequence 19, 10, 11, 18, 38 ? I received this image in a WhatsApp group. I don't know the book from which it is taken. It is question 140 of the image
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### Math Snake Puzzle

A colleague recently showed me the following puzzle game and I'm interested in how this can be solved. I thought it would be a good talking point for you guys as well :) A detailed description of ...
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### Work and efficiency puzzle

There are $2$ people $A$ and $B$. $A$ requires $a\;$ days to complete certain amount of work and $B$ requires $b\;$ days to complete the same amount of work. If $A$ begins the work a day before $B$ ...
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### What would be the solution to this logic puzzle? [on hold]

This is the puzzle I am having trouble in understanding Also, do explain me the question along with the answer. Thank You
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### Find the sum of angles without trigonometry?

I have found the sum it's $180$ but using right triangle and sine theorem.
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### Maximum length sequence with negative and positive subsequences

From ' mathematical puzzles' By Peter Winkler: " At the stockholders' meeting the CEO presents month-by-month profits and losses and declares : ' Since the last meeting we have made a profit in ...
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### Find $I$ in $\frac{\overline{SIX}}{\overline{NINE}}=\frac23$

In $\frac{\overline{SIX}}{\overline{NINE}}=\frac23$ every letter denotes a UNIQUE digit,find $I$. Expanding the fraction in base $10$ we have: $300S+30I+3X=2020N+200I+2E$ , but this doesn't ...
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### A cool number-theoretic puzzle in IMAT: find the last digit

This test is from IMAT 2015 (International Medical Admission Test): When I made a hotel reservation online yesterday I was given an $8$ digit booking reference which contained no zeros. It did, ...
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### Circle Puzzle Geometry

Two friends are playing a game. One friend stands in the middle of a circle radius 100m. His objective is to leave the circle. He may take one step at a time, distance 1m, in any direction. However, ...
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### Nice explanation for simple puzzle

There is a simple game with coins that goes as follows. You have $x$ coins and two players who take turns. Each player can either remove one or two coins. The winner is the person who removes the ...
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