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Category Archives: Puzzles
Puzzle #190: Escalator Race
I cannot stop loving the book A Moscow Math Circle – Week by week problem sets by Sergey Dorinchenko. So here is another one from this great collection. Anisha and Arushi are riding down an escalator. Halfway down the escalator, … Continue reading
Puzzle #189: Blue Eyed Sisters
A very interesting two minute puzzle from Martin Gardner’s The Colossal Book of Short Puzzles and Problems. Please do share this with your children as well. If you happen to meet two of the Jones sisters (this assumes that the … Continue reading
Puzzle #188: Jars and Paints
I will be taking a break from puzzles for the next two weekends after this post! My fascination with A Moscow Math Circle (Week by week Problem Sets) by Sergey Dorichenko continues. Here is another one from there. Each of … Continue reading
Puzzle #187: Sum as 100
I seem to be enamoured with this book at the moment, and hence another one from A Moscow Math Circle – Week by Week Problem Sets by Sergey Dorichenko. Is it possible to write more than 50 two digit numbers … Continue reading
Puzzle #186: 4×4 Grid
This is another wonderful puzzle from A Moscow Math Circle, Week by week problem Sets by Sergey Dorichenko. There are two parts to the problem: (a) Place seven stars in a 4×4 grid so that, no matter which two rows … Continue reading
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
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
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
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
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
Alok Goyal's Puzzles Page 