Category Archives: Puzzles

Puzzle #60: Hats and Survival

Posted on April 26, 2014 by Alok Goyal

I just heard this puzzle 15 minutes back at Alok Mittal’s Mathematical Circles where he gave this puzzle to all the children. Great puzzle – will encourage all children as well as adults to try this. There is an unlimited … Continue reading →

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Puzzle #59: Can You Move the Knights?

Posted on April 19, 2014 by Alok Goyal

This is a very interesting problem I discovered today while trying to prepare for a Mathematical Circles lesson organized by Alok Mittal, where he is teaching a group of children mathematics through puzzles. The puzzle is also from the book … Continue reading →

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Puzzle #58: The Survivor

Posted on April 12, 2014 by Alok Goyal

This is a fantastic puzzle…those of you who have not seen this before and like puzzles will have a ball of a time! I took the puzzle from a site called http://www.mindcipher.com Here is the puzzle: There are 1500 people … Continue reading →

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Puzzle #57: Sam Lloyd’s Puzzling Scales

Posted on April 6, 2014 by Alok Goyal

This is a puzzle by a famous American “puzzler” Sam Lloyd. Sam was a famous chess player, ranked 15th in the world at his best. He is also the creator of many famous puzzles. The following puzzle is in the … Continue reading →

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Puzzle #56: Toothpick Giraffe Puzzle

Posted on March 31, 2014 by Alok Goyal

Found this cute brain teaser from a website (http://mesosyn.com/), though the original is a Martin Gardner puzzle that appeared in New York Times. Five toothpicks form the giraffe shown above. Change the position of just one pick and leave the … Continue reading →

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Puzzle #55: Three Sages

Posted on March 17, 2014 by Alok Goyal

This is a puzzle that has many variations, I heard this first time in Class XI, through my then class teacher Ravi Gopinath. The current version is from the book “The Moscow Puzzles” by Boris A. Kordemsky (Edited by Martin … Continue reading →

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Puzzle #54: True or False?

Posted on March 8, 2014 by Alok Goyal

This is a cute puzzle I found today in a Martin Gardner book, while attending a Mathematical Circles class at Alok Mittal’s home. Very cute – only a 2 minute puzzle! Evaluate each of the 10 statements s to its … Continue reading →

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Puzzle #53: Make a Century!

Posted on March 2, 2014 by Alok Goyal

Thanks to Alok Mittal for sharing this cute problem to which there are many answers…limited only by your creativity! Insert mathematical signs between digits 1,2,3,4,5,6,7,8,9 to make an expression that equals 100. The digits must remain in the same sequence. … Continue reading →

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Puzzle #52: How Many People Partying?

Posted on February 14, 2014 by Alok Goyal

Thanks to Anirudh Baddepudi for contributing this puzzle. I also do not know the answer yet and hence looking forward to enjoying this one. At a party, seven people know seven others, and the remaining people each know 5 other … Continue reading →

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Puzzle #51: Color of the Cap

Posted on February 8, 2014 by Alok Goyal

This is a very well known puzzle and there are many variations of this puzzle. I picked this one up from “Mathematical Circles” by Dmitri Fomin, Sergey Genkin and Ilia Itenberg, Chapter #8, Problem #8. Three people – A, B … Continue reading →

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