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Category Archives: Puzzles
Puzzle #39: Triangle of Cards
I was gifted a new puzzle and math book by a friend today – Professor Stewart’s Cabinet of Mathematical Curiosities. This is a puzzle from this book, appearing on Page #6. Thanks Shalu for the book. I have 15 cards, … Continue reading
Puzzle #38: Famous Handshake Puzzle
This one is one of my favorites from the Martin Gardner collection: My wife and I recently attended a party at which there were four other married couples. Various handshakes took place. No one shook hands with himself or herself … Continue reading
Puzzle #37: Four 9’s and 100
This one is a relatively easy one and something that can be attempted by folks of all age groups. I picked it up on the internet from the following site: http://www.puzzles2puzzleu.com/ You have four 9’s and you may use any of … Continue reading
Puzzle #36: Professor on the Escalator
This is a very tantalizing puzzle from one of the Martin Gardner books “More Mathematical Puzzles and Diversions” (Chapter 14, Puzzle #4). When Professor Stanislaw Slapenarski, the Polish mathematician, walked very slowly down the down-moving escalator, he reached the bottom after taking 50 steps. As … Continue reading
Puzzle #35: Staying Alive in a Desert
I saw this puzzle at the recently organized TiE Conference in Delhi – so thanks to Priya who posted this puzzle. Here it goes: You are a traveler in a desert full of mosquitoes. You know that if you get … Continue reading
Puzzle #34: Another Set of Magic Squares
I found this very nice set of number puzzles on the net on the following site – http://www.mathsphere.co.uk. The puzzle looks pretty innocuous, and by sheer brute and force, you can try to solve it, though it is not very … Continue reading
Puzzle #32: Removing the Coins
This is a very nice geometry puzzle taken from the Mathematical Circus, by Martin Gardner. The puzzle is originally devised by Kobon Fujimura, a leading puzzler from Japan. Look at the figure below which has 10 coins arranged as an … Continue reading
Puzzle #31: Which Day Does Rahul Speak the Truth?
This is a very cute puzzle which I read on the internet somewhere, but do not remember the source. In case anyone knows the source, please do let me know, I would love to credit the person. This is a … Continue reading
Puzzle #30: Red, White and Blue Weights
Back to weights – Found this very nice puzzle in Mathematical Circus, by Martin Gardner (Chapter 11, Problem #6). This one was originally created by Paul Curry, who was also an amateur magician. You have six weights. One pair is … Continue reading
Puzzle #29: Scrambled Box Tops
This is very cute puzzle, more like a quick teaser that can be a nice dining table puzzle. I was initially asked this puzzle by a friend of my daughter on her 9th birthday. I rediscovered the problem recently in … Continue reading
Alok Goyal's Puzzles Page 