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Monthly Archives: July 2017
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
Solution to Puzzle #187: Sum as 100
I am back after a break of two weekends in-between during which I moved from Gurgaon to Bangalore. Lets begin with the answer to this puzzle. I received many correct answers – from Anahat Prakash, Deepak Goyal (my brother) and … 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
Solution to Puzzle #186: 4×4 Grid
This was a simple puzzle, a classical application of the pigeon hole principle. I got correct answers from Deepak Goyal (my brother in NY), Mahi Saraf (as always) and Pratik Poddar (as always again). I am taking the liberty 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
Solution to Puzzle #185: Marker on a 9×9 Board
This was a great puzzle, and I received correct answers from Suman Saraf and Prakhar – very well done! Please see the figure below. Let’s divide the entire board, except for the central square, into 2×1 dominos. For example, it … Continue reading
Alok Goyal's Puzzles Page 