Tag Archives: Numbers puzzles

Solution to Puzzle #189: Blue Eyed Sisters

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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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

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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

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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 #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 #177: How Many Times You Can Measure

This is a variation of Puzzle #14 (https://alokgoyal1971.com/2013/04/28/puzzle-14-measuring-time/) that I found on the site fivethirtyeight.com. A fantastic puzzle! Suppose you have four ropes and a lighter. Each rope burns at a non-constant rate but takes exactly one hour to burn … Continue reading

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Solution to Puzzle #172: Divisibility by First 13 Numbers

This was perhaps too simple a problem, to the point that very few responded 😦 Thanks to Abhinav Jain and Pratik Poddar for sending in the correct answers. The answer is 360,360. We are already told that the answer for … Continue reading

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