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Tag Archives: Numbers puzzles
Solution to Puzzle #192: Too Many 6’s
This was a difficult manipulation of numbers, and I received 4 answers from Mahi Saraf, Anand Singhi, Pratik Poddar and Prakhar Prakash. Only two of these I found to be completely correct – from Mahi Saraf and Anad Singhi. That … Continue reading
Puzzle #192: Too Many 6’s
This is another beautiful puzzle from A Moscow Math Circle, Week by Week Problem Sets by Sergey Dorichenko. The puzzle will require some manipulation of numbers, but is very solvable and you will be happy that you did it once … Continue reading
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
Solution to Puzzle #187: Sum as 100
I am back after a break of two weekends inbetween 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 #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 #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
Puzzle #183: 8 Digits
This is another 2minute 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 #177: How Many Times You Can Measure
This is a variation of Puzzle #14 (https://alokgoyal1971.com/2013/04/28/puzzle14measuringtime/) that I found on the site fivethirtyeight.com. A fantastic puzzle! Suppose you have four ropes and a lighter. Each rope burns at a nonconstant rate but takes exactly one hour to burn … Continue reading
Solution to Puzzle #172: Divisibility by First 13 Numbers
This was perhaps too simple a problem, to the point that very few responded ðŸ˜¦ 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
Puzzle #171: Buying Dimsums
This is a beauty of a puzzle sent by Suman Saraf – thanks Suman! A fast food restaurant sells dimsums in boxes of 7 and 3. What’s the greatest number of dimsums a person cannot buy. Generalize it for p … Continue reading