Tag Archives: Alok Goyal

Puzzle #191: 1×4 Rectangular Stone Plates

Posted on August 13, 2017 by Alok Goyal

This is a gem of a puzzle from A Moscow Math Circle, Week by Week Problem Sets by Sergey Dorichenko. Can a 10×10 square be paved with 1×4 rectangular stone plates? As always, please send your answers as comments within … Continue reading →

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Solution to Puzzle #189: Blue Eyed Sisters

Posted on August 13, 2017 by Alok Goyal

This was a simple puzzle, and I got correct solutions from Praneeth, Prartik Poddar and Suman Saraf. Well done all. I am borrowing the answer from Suman. For this, the most likely answer is 3 blue eyed out of 4 … Continue reading →

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Puzzle #190: Escalator Race

Posted on August 8, 2017 by Alok Goyal

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 →

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Solution to Puzzle #188: Jars and Paints

Posted on August 8, 2017 by Alok Goyal

Apologies for late posting of the solution to this puzzle, but better late than never! This puzzle was similar to one of the first puzzles I posted (Milkman and the Three Jars – https://alokgoyal1971.com/2013/02/03/puzzle-2-milkman-and-the-three-jars/). I received correct answers from Suman Saraf … Continue reading →

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Puzzle #189: Blue Eyed Sisters

Posted on July 30, 2017 by Alok Goyal

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 →

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Solution to Puzzle #187: Sum as 100

Posted on July 30, 2017 by Alok Goyal

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 →

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Puzzle #188: Jars and Paints

Posted on July 9, 2017 by Alok Goyal

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 →

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Solution to Puzzle #186: 4×4 Grid

Posted on July 9, 2017 by Alok Goyal

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 →

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Puzzle #187: Sum as 100

Posted on July 2, 2017 by Alok Goyal

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 →

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Solution to Puzzle #185: Marker on a 9×9 Board

Posted on July 2, 2017 by Alok Goyal

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 →

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