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Author Archives: Alok Goyal
Puzzle #131: The Pyramid Problem
This is a beautiful geometry puzzle contributed by my nephew, Karan Sharma. The puzzle originally appeared in a PSAT exam in 1980, and was not really a “puzzle” until one student proved that there was a different answer than what … Continue reading
Solution to Puzzle #129: The Einstein’s Puzzle
I got many answers for this puzzle, I think the title attracted quite a few people. First person to send the correct answer was Radhika Goyal, just ahead of her dad (Deepak Goyal), who was 10 minutes behind her. Others … Continue reading
Puzzle #130: The Plato Riddle
I am on a roll here with the old-time biggies, after Einstein we have Plato now! This is a beautiful puzzle and riddle contributed by Sirisha Gadepalli, an IIT Campus friend – thank you Sirisha! Here it goes: Aristotle was … Continue reading
Solution to Puzzle #128: The Milkman Again
Apologies for not posting last weekend, I was traveling, and am likely to be traveling quite a bit in the next month, so there will be some irregularity in posting. This was a relatively simple one, lots of people sent … Continue reading
Puzzle #129: The Einstein’s Puzzle
I am sure the title will catch everyone’s attention. It is a very cute puzzle that Einstein invented as a child. The puzzle is also attributed to Lewis Carroll. There are many versions of this puzzle, the one here is … Continue reading
Solution to Puzzle #127: Building and Eggs Again
This was a difficult puzzle, and I did not get any complete answer from anyone. Ofcourse, Alok Aggarwal, who contributed the puzzle, had an answer. I will replicate the answer I gave to Alok. The answer is 8, i.e. within … Continue reading
Puzzle #128: The Milkman Again
Almost 3 years back, I had posted a milkman puzzle, which was the second puzzle I posted (https://alokgoyal1971.com/2013/02/10/solution-to-puzzle-2-milkman-puzzle/). Here again is a modified version of the same puzzle. A very interesting puzzle that Alok Mittal gave to his Mathematical Circles … Continue reading
Solution to Puzzle #126: The Tricky Square Root
Again received an overwhelming number of answers to this puzzle. People who answered it correctly included Pratik Poddar, Anant Aggarwal, Siddharth Mulherkar, Suman Saraf, P R Kumar and Amit Mittal. The puzzle had a simple trick to it, which is … Continue reading
Puzzle #127: Building and Eggs Again
This is a wonderful puzzle shared by a good friend Alok Aggarwal, who lives in California and are a family of math wizards (which includes him as well!). This puzzle is a variation of puzzle #94 (https://alokgoyal1971.com/2015/03/01/puzzle-94-two-eggs-and-a-building/), where with two … Continue reading
Solution to Puzzle #125: Test Your Creativity
I was overwhelmed not only by the response, but also by the creativity. While I do not like to single people out, Suman Saraf turned out to be the champion of creativity on this one, had some remarkable variations that … Continue reading
Alok Goyal's Puzzles Page 