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Author Archives: Alok Goyal
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
Solution to Puzzle #184: The Sage and the Pharmacist
This was a different kind of puzzle, and I was happy to see the response. I got correct answers from Mahi Saraf, Sahaj Sharma (my nephew from Jaipur) and Pratik Poddar – well done all. Thanks again to Alok Mittal … 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
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 #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
Solution to Puzzle #182: Weights and Balance Once More
This was a difficult puzzle. I got two correct answers – From Suman Saraf and Anahat (Prakhar’s son). Well done, or rather – excellent! Here is the solution for 5 weights – copying solution from Suman. let’s say the weights … 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
Solution to Puzzle #181: Hidden Cross
This was a simple puzzle, but I did not get as many solutions as I would have expected. Both Suman Saraf and Pratik Poddar sent the right answers, along with three people at home – Karan Sharma (my nephew) and … 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
Solution to Puzzle #180: White and Black Beans
This was one of the simpler puzzles and I got correct answers from many. This included Mahi Saraf, Anahat (Prakhar’s son), Vishal Poddar, Pratik Poddar and Praneeth. Well done all. The answer is “white”. I am borrowing the answer from … Continue reading