Category Archives: Puzzles

Puzzle #119: A Prime Cryptarithm

Posted on October 25, 2015 by Alok Goyal

This is a wonderful puzzle taken from the book “The Moscow Puzzles” by Boris A. Kordemsky. This book has a great collection of puzzles. In this remarkable puzzle, each digit is a prime (2, 3, 5 or 7). No letters … Continue reading →

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Puzzle #118: Rotating Disk

Posted on October 11, 2015 by Alok Goyal

Taking another puzzle from Alok Mittal’s class – another beautiful puzzle! Look at the graphic below. While the graphic contains the entire puzzle, am repeating it here: Six players – call them A, B, C, D, E and F – … Continue reading →

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Puzzle #117: Mr. Calendar

Posted on October 6, 2015 by Alok Goyal

This is a beautiful brain teaser that my wife, Pooja, asked me a few days back just before we were going to sleep – yes this was our pillow talk 🙂 Mr. Calendar spends a sum equal to the date … Continue reading →

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Puzzle #116: The Magic Card Frame

Posted on September 27, 2015 by Alok Goyal

Yet another wonderful numbers puzzle from Alok Mittal’s Mathematical Circles class. Not too difficult, and yet a lot of fun! Take 10 cards of the same suite from Ace (A) through 10, i.e. essentially numbers 1-10. Using each card exactly … Continue reading →

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Puzzle #115: The First Rabbit

Posted on September 21, 2015 by Alok Goyal

This is a puzzle I got recently from my daughter, Anisha, who in turn got this puzzle from Alok Mittal’s Mathematical Circles Class. There is an island on which a rabbit arrives. Rabbit reproduces, as part of which it gives … Continue reading →

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Puzzle #114: 1978

Posted on September 12, 2015 by Alok Goyal

This is a puzzle for the number buffs that I found on http://www.mindcipher.com The year 1978 is such that the sum of the first two digits and the latter two digits is equal to the middle two digits, i.e. 19 … Continue reading →

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Puzzle #113: Magic Arrangement of Cards

Posted on September 6, 2015 by Alok Goyal

This is a puzzle I have known for a very long time, and do not remember who asked me, I probably did it when I must have been around 15 years old. I loved this puzzle of cards. Unlike other … Continue reading →

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Puzzle #112: Weights and Balance Revisited

Posted on August 29, 2015 by Alok Goyal

This is a twist to a puzzle which has been around for a very long time. I have myself looked at this puzzle since I was a kid, but a twist (or a potential flaw) to the puzzle was recently pointed … Continue reading →

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Puzzle #111: Soldiers in a Line

Posted on August 23, 2015 by Alok Goyal

This is another beautiful puzzle that I got through my daughter (Anisha) and her friend (Abhiram), which they got in Alok Mittal’s Mathematical Circles class. In a line up of 10 soldiers, what is the least number of soldiers that … Continue reading →

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Puzzle #110: Circular Dining Table

Posted on August 15, 2015 by Alok Goyal

I am leaving for a vacation, and hence not able to post the solution to the last week’s puzzle. In the meantime, here is another puzzle, will post the answers to both next week. This puzzle is courtesy Alok Mittal, … Continue reading →

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