Tag Archives: Alok Goyal

Puzzle #185: Marker on a 9×9 Board

This is a wonderful puzzle, this time from a relatively lesser used source – A Moscow Math Circle, Week by week Problem Sets, by Sergey Dorichenko. One marker is placed in the center of a 9×9 board. Anisha and Arushi … Continue reading

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Solution to Puzzle #183: 8 Digits

This was a relatively simple problem. I was happy to see my 10 year old, Arushi, solve this one. I also got correct answers from Karan Sharma, Mahi Saraf, Anahat Prakash, Pooja Goyal, Pratik Poddar and Suman Saraf. Well done … Continue reading

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Puzzle #184: The Sage and the Pharmacist

This is a beautiful riddle that I am borrowing from Alok Mittal’s Mathematical Circles class. In a far away land, it was known that if you drank poison, the only way to save yourself is to drink a stronger poison, … Continue reading

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Solution to Puzzle #182: Weights and Balance Once More

This was a difficult puzzle. I got two correct answers – From Suman Saraf and Anahat (Prakhar’s son). Well done, or rather – excellent! Here is the solution for 5 weights – copying solution from Suman. let’s say the weights … Continue reading

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Puzzle #183: 8 Digits

This is another 2-minute problem that kids will enjoy. Found this one again in Martin Gardner’s The Colossal Book of Short Puzzles and Problems. Look at the figure below, which has 8 empty circles. You need to place digits 1 … Continue reading

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Solution to Puzzle #181: Hidden Cross

This was a simple puzzle, but I did not get as many solutions as I would have expected. Both Suman Saraf and Pratik Poddar sent the right answers, along with three people at home – Karan Sharma (my nephew) and … Continue reading

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Puzzle #182: Weights and Balance Once More

Somehow puzzles on weights and balances just never end! I found this great one in Martin Gardner’s The Colossal Book of Short Puzzles and Problems. Five objects, no two the same weight, are to be ranked in order of increasing … Continue reading

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