Author Archives: Alok Goyal

Solution to Puzzle #55: Three Sages

Posted on March 31, 2014 by Alok Goyal

Apologies for the delay in posting the answer…I was on vacation for a week. I got two correct answers to this puzzle – found this puzzle to be just a little tough for younger children, and did not receive any … Continue reading →

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Puzzle #55: Three Sages

Posted on March 17, 2014 by Alok Goyal

This is a puzzle that has many variations, I heard this first time in Class XI, through my then class teacher Ravi Gopinath. The current version is from the book “The Moscow Puzzles” by Boris A. Kordemsky (Edited by Martin … Continue reading →

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Solution to Puzzle #54: True or False?

Posted on March 17, 2014 by Alok Goyal

This was a very simple puzzle, more of a quick teaser, and many people sent correct answers. First ones to send in were Anirudh Baddepudi, Amit Gupta, Anurag Khaitan and Rhea Mittal – well done! The correct answer is “Exactly … Continue reading →

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Puzzle #54: True or False?

Posted on March 8, 2014 by Alok Goyal

This is a cute puzzle I found today in a Martin Gardner book, while attending a Mathematical Circles class at Alok Mittal’s home. Very cute – only a 2 minute puzzle! Evaluate each of the 10 statements s to its … Continue reading →

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Solution to Puzzle #53: Make a Century

Posted on March 8, 2014 by Alok Goyal

Addendum to the answer…Shruti Mittal sent 6 more correct asnwers – Well done Shruti!             (-1*2)-3-4-5+6*7+8*9=100           1+(2*3)+(4*5)+(-6+7)+(8*9)           1*(2+3)*4*5*(6-7)*(8-9)           1*(2+3)*Sqrt(4)*5*{-[(6-7)+(CubeRoot(8)-Sqrt(9)]}   … Continue reading →

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Puzzle #53: Make a Century!

Posted on March 2, 2014 by Alok Goyal

Thanks to Alok Mittal for sharing this cute problem to which there are many answers…limited only by your creativity! Insert mathematical signs between digits 1,2,3,4,5,6,7,8,9 to make an expression that equals 100. The digits must remain in the same sequence. … Continue reading →

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Solution to Puzzle #52: How Many People Partying?

Posted on March 2, 2014 by Alok Goyal

This was a relatively difficult puzzle, but I was surprised to see the number of people who attempted the answer. The best and the correct answer came from Alok Kuchlous and also from Challapalli. The one from Alok is very … Continue reading →

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Puzzle #52: How Many People Partying?

Posted on February 14, 2014 by Alok Goyal

Thanks to Anirudh Baddepudi for contributing this puzzle. I also do not know the answer yet and hence looking forward to enjoying this one. At a party, seven people know seven others, and the remaining people each know 5 other … Continue reading →

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Solution to Puzzle #51: Color of the Cap

Posted on February 14, 2014 by Alok Goyal

This was a relatively simple puzzle and the response was again awesome – thanks everyone! The first one to come back with the correct answer was Radhika Goyal from NY. Also got correct answers from Vivek Sheel, Anirudh Baddepudi, Sirisha … Continue reading →

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Puzzle #51: Color of the Cap

Posted on February 8, 2014 by Alok Goyal

This is a very well known puzzle and there are many variations of this puzzle. I picked this one up from “Mathematical Circles” by Dmitri Fomin, Sergey Genkin and Ilia Itenberg, Chapter #8, Problem #8. Three people – A, B … Continue reading →

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