Monthly Archives: September 2013

Puzzle #33: Running in Circles

Posted on September 28, 2013 by Alok Goyal

This is a very nice puzzle from a close friend – Maneesh Dube, based out of New Jersey. Maneesh and his daughter, Nandini, are running around a circular park. Maneesh is running faster than Nandini. How much faster is Maneesh … Continue reading →

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Solution to Puzzle #32: Removing the Coins

Posted on September 28, 2013 by Alok Goyal

This was a relatively simple puzzle, though surprisingly I got very few answers – I guess people do not like geometric puzzles as much. I got three correct answers this time, including the one from Arushi (my 6 year old) … Continue reading →

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Puzzle #32: Removing the Coins

Posted on September 23, 2013 by Alok Goyal

This is a very nice geometry puzzle taken from the Mathematical Circus, by Martin Gardner. The puzzle is originally devised by Kobon Fujimura, a leading puzzler from Japan. Look at the figure below which has 10 coins arranged as an … Continue reading →

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Solution to Puzzle #31: Which Day Does Rahul Speak the Truth

Posted on September 23, 2013 by Alok Goyal

I got many answers to this puzzle, and there was a very good response. Most of you answered the puzzle correctly. The first ones I got correct were from Anku Jain and Sid Pareek. The correct answer is Tuesday. Here … Continue reading →

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Puzzle #31: Which Day Does Rahul Speak the Truth?

Posted on September 16, 2013 by Alok Goyal

This is a very cute puzzle which I read on the internet somewhere, but do not remember the source. In case anyone knows the source, please do let me know, I would love to credit the person. This is a … Continue reading →

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Solution to Puzzle #30: Red, White and Blue Weights

Posted on September 16, 2013 by Alok Goyal

This was a relatively difficult puzzle for many children, and I did not get too many responses. The only correct answer amongst the younger lot came from Smiti Mittal – congrats Smiti! I also got a correct answer from Ruchir, … Continue reading →

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Puzzle #30: Red, White and Blue Weights

Posted on September 8, 2013 by Alok Goyal

Back to weights – Found this very nice puzzle in Mathematical Circus, by Martin Gardner (Chapter 11, Problem #6). This one was originally created by Paul Curry, who was also an amateur magician. You have six weights. One pair is … Continue reading →

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Solution to Puzzle #29: Scrambled Box Tops

Posted on September 8, 2013 by Alok Goyal

This was a relatively simple puzzle, and as such I got a lot of answers, many of them within minutes of my posting the puzzle. This one was originally solved by Anisha, my 9 year old, on her birthday. I … Continue reading →

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Puzzle #29: Scrambled Box Tops

Posted on September 1, 2013 by Alok Goyal

This is very cute puzzle, more like a quick teaser that can be a nice dining table puzzle. I was initially asked this puzzle by a friend of my daughter on her 9th birthday. I rediscovered the problem recently in … Continue reading →

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Solution to Puzzle #28: Cake Cutting

Posted on September 1, 2013 by Alok Goyal

I got a relatively muted response to this puzzle, but some very interesting answers among them. Specifically, I want to congratulate Mayuri+Mehul, as well as Tishyaa for very innovative answers. Jyotsana Dube also sent a correct answer, but not universally … Continue reading →

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