Monthly Archives: July 2015

Puzzle #108: The Double Square Number Problem

Posted on July 26, 2015 by Alok Goyal

While browsing through mind cipher.com, I came across this wonderful puzzle…a good puzzle for those who love to play with numbers. It’s said that a number N with 4 digits is a double-square number when it equals the sum of … Continue reading →

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Solution To Puzzle #107: The Longest Path

Posted on July 26, 2015 by Alok Goyal

I was surprised to see relatively fewer answers for this puzzle. I received two partially correct answer and one fully correct answer. Anisha, my 11 year old, correctly pointed out the maximum length, and so did Mayank Aggarwal from California. … Continue reading →

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Puzzle #107: The Longest Path

Posted on July 19, 2015 by Alok Goyal

I read this beautiful puzzle in the book “Invitation to a Mathematical Festival” by Ivan Yashchenko. Take a look at the figure below. A tourist wants to walk along the streets of Old Town from the train station (A) to … Continue reading →

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Solution to Puzzle #106: Cards and Two Magicians

Posted on July 19, 2015 by Alok Goyal

A delightful puzzle – thanks again to Pallav Pandey! Also for a change, I had a chance to work on a puzzle myself as someone else contributed. I loved solving the puzzle along with my 11 year old daughter Anisha. … Continue reading →

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Puzzle #106: Cards and Two Magicians

Posted on July 11, 2015 by Alok Goyal

This is a very interesting puzzle contributed by Pallav Pandey – thanks Pallav! I have not solved it yet, and looking forward to working on it! Magician M1, calls an audience on stage who pulls random 5 cards from the … Continue reading →

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Solution to Puzzle #105: The 150 Year Old Puzzle

Posted on July 11, 2015 by Alok Goyal

This was indeed a more difficult puzzle than it appeared and for a change I did not get any correct solution. One realises that after trying a few combinations for the first 2-3 days, one invariably gets stuck in a … Continue reading →

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Puzzle #105: 150 Year Old Puzzle

Posted on July 4, 2015 by Alok Goyal

This is truly an old puzzle. I was sent this one by Salik Shah (thank you Salik). It appeared in the WIRED magazine. I am reproducing the puzzle verbatim as I saw it in WIRED: IN 1850, THE Reverend Thomas … Continue reading →

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Solution to Puzzle #104: Togglers Puzzle

Posted on July 4, 2015 by Alok Goyal

Apologies for an inordinate delay in posting the answer to this puzzle. I was on vacation with children over the last 3 weekends 🙂 This was a very interesting, though a slightly difficult puzzle. I got 4 correct answers from … Continue reading →

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