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Author Archives: Alok Goyal
Puzzle #176: Outsmart Your Teacher
This is a relatively simple puzzle from fivethirtyeight.com, a site from which I have posted many puzzles in the past. Variations of such puzzles have been posted in the past. I would encourage parents to try this with their children. … Continue reading
Solution to Puzzle #174: Happy Birthday!
This puzzle was not an easy one, and one of the ways to make it easier was to solve it for a smaller number of candles and then try to solve for larger number of candles. There is a whole … Continue reading
Solution to Puzzle #173: Dividing a Circle into 7 Parts
This was a beautiful puzzle and amongst my favourite geometry puzzles. Unfortunately I did not get a perfect answer from anyone, even though I did receive an answer from Abhinav Jain and Pratik Poddar. I am taking the liberty of … Continue reading
Puzzle #175: The Three Bag Puzzle
Apologies for a long break, I was in the middle of some hectic travel, both for personal and business reasons. But normal service resumes 🙂 Thanks to Suman Saraf yet again for recommending this puzzle. A variation of this puzzle … Continue reading
Puzzle #174: Happy Birthday!
This is a very nice puzzle from fivethirtyeight.com (thanks to Suman Saraf for pointing this site to me). It’s your 30th birthday, and your friends got you a cake with 30 lit candles. You try to blow them out, but … Continue reading
Solution to Puzzle #172: Divisibility by First 13 Numbers
This was perhaps too simple a problem, to the point that very few responded 😦 Thanks to Abhinav Jain and Pratik Poddar for sending in the correct answers. The answer is 360,360. We are already told that the answer for … Continue reading
Puzzle #173:Diving a Circle Into 7 parts
This is yet another wonderful puzzle sent by Suman Saraf. Thanks Suman! Given a circle and it’s diameter, how can you partition it’s area into seven equal regions without using straight lines. As always, please send your answers as comments … Continue reading
Solution to Puzzle #171: Buying Dimsums
Many puzzles sometimes give you a glimpse of some amazing brilliance that lies all around us – this was one such puzzle. While many of you gave the correct answer for the number (which is 11), and this included Abhinav … Continue reading
Puzzle #172: Divisibility by first 13 numbers
I acquired a new book recently (thanks to Suman Saraf) – Problem Solving Strategies in Mathematics. Here is a problem from that book. It is a simple problem for adults, so will request people to show it to their children. … Continue reading
Solution to Puzzle #170: Rectangle and the Oil Well
I got many correct answers, thanks to all who responded. This was a “simple” application of pythogoras theorem. I got correct answers from Abhinav Jain, Pratik Poddar, Karan, Praneeth Ruthala, Suman Saraf and Mahi Saraf. While everyone sent me only … Continue reading
Alok Goyal's Puzzles Page 