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Category Archives: Puzzles
Puzzle #11: The 10-digit number
This is a very nice puzzle I picked up a few days back from one of the Martin Gardner books. I also tried it with my 8 year old, who solved it with some persuasion. In the 10 cells of the … Continue reading
Solution to Puzzle #10: Who is taller
I thought that this was a relatively simple problem – Most people gave me the correct answer, but I did not receive the correct proof for the answer from anyone. The answer is – the shortest of the tallest in … Continue reading
Puzzle #10: Who is Taller?
This is a relatively simple puzzle after a rather difficult one, I would encourage people to try this one with kids. In a rectangular array of people, who will be taller – the tallest of the shortest person in each … Continue reading
Solution to Puzzle #9 – Sailors, Monkey and Coconuts
Before I give the solution, I owe it everyone to reveal the original source, which appeared in Scientific American. Here is the exact source: Martin Gardner, Mathematical Games, Scientific American, April 1958. Martin Gardner, The Second Scientific American Book of … Continue reading
Puzzle #9: Sailors, Monkey and Coconuts
Thanks to Vikas Vats for contributing this puzzle, and was originally given to us by our class teacher in Class XI, Ravi Gopinath. This is an interesting one, though could be tough for children below 12 years of age. Five … Continue reading
Solution to Puzzle #8: Maximizing the Odds
This one was a relatively simple puzzle, though not really for children below 12 years as they are not as familiar with the probability concept. I am not posting a video solution to this as there is not much value … Continue reading
Puzzle #8: Maximizing the Odds
Here is a cute problem given to me by a friend, who mentioned that this was part of the Martin Gardner collection. There are two identical urns, and there are 50 identical red balls and 50 identical white balls. All … Continue reading
Solution to Puzzle #7: Faulty Ball Continued
I need to begin with an apology – I have not been able to create a video solution to this puzzle as I seem to have misplaced the writing instrument for my iPad. Hence a written solution to this one, … Continue reading
Puzzle #7: Faulty Balls Continued…
Lets take a slightly different version of the faulty balls – You have multiple machines producing table tennis balls. Each ball is supposed to weigh 10 grams. One of the machines is faulty and is producing balls of either 9 … Continue reading
Solution to Puzzle #6: Identifying the Faulty Ball
I was very happy to see many new “puzzle solvers” for this puzzle. I was particularly impressed with Aadi Kuchlous and Sahil Kuchlous who solved the 6 and the 9 balls puzzle respectively. Same is true for Arushi and Anisha … Continue reading
Alok Goyal's Puzzles Page 