Category Archives: Puzzles

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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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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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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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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Puzzle #181: Hidden Cross

This is a wonderful puzzle – one of those “2 minute” puzzles that will be fun to do as a family. I have taken this from Martin Gardner’s Colossal Book of Short Puzzles and Problems. It appeared originally in the … Continue reading

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Puzzle #180: White and Black Beans

This is a wonderful puzzle for all ages from Alok Mittal’s weekly Math Circles class. The puzzle is doable by everyone, so please do try yourself and also have your children try this one. A pot contains 75 white beans … Continue reading

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Puzzle #179: Crossing the River

After a rather difficult puzzle, here is an easy one, should take just a few minutes even for children, please do try! This one is from the site mathsisfun.com. Four adventurers (Alex, Brook, Chris and Dusty) need to cross a … Continue reading

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