Monthly Archives: May 2014

Puzzle #65: The On-Off Game

Posted on May 31, 2014 by Alok Goyal

This is a relatively common puzzle and available in many puzzle books. Interesting one, good to try with kids. There are 100 light switches, all of them are off. First, you walk by them, turning all of them on. Next, … Continue reading →

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Solution to Puzzle #64: Unique Country

Posted on May 31, 2014 by Alok Goyal

I think I went a little bit overboard with the puzzle I posted last week…did not get any correct answer. Was hoping that there must be some Computer Scientists who will send me the answer! Anyway the answer is that … Continue reading →

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Puzzle #64: Unique Country

Posted on May 24, 2014 by Alok Goyal

This is a very nice application of graph theory for children, a puzzle I picked up from the book “Mathematical Circles”, by Dmitri Fomin, Sergey Genkin and Ilia Itenberg. There is a unique country (lets call it Strangistan), where there are … Continue reading →

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Solution to Puzzle #63: The Funny Equation

Posted on May 24, 2014 by Alok Goyal

Thanks for a great response…got many correct answers, including some first timers. Anirudh Baddepudi was the first one to come back with the correct answer. Also had correct answers from Adila Sebastian, Rajesh Thakur, Anshu Goyal and Anubhav Gupta. Correct … Continue reading →

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Puzzle #63: The Funny Equation

Posted on May 17, 2014 by Alok Goyal

Great small numbers puzzle for children! I found this one in a new book that I bought last week “World’s Toughest Puzzles” by Charles Barry Townsend. Puzzles are not as tough as the name of the book suggests 🙂 One … Continue reading →

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Solution to Puzzle #62: How Much Did I Drink?

Posted on May 17, 2014 by Alok Goyal

Many people did this one correctly. First one to send the right answer was Ashish Gupta, my colleague at Helion. Also got correct answer from Pooja Goyal and Anirudh Baddepudi. Many people typically attempt this problem by doing a series, … Continue reading →

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Puzzle #62: How Much Did I Drink?

Posted on May 10, 2014 by Alok Goyal

This is another puzzle I picked up from Brilliant.org posted by Can Hou and the puzzle is originally from Oxford University interviews. I have a pint of orange juice. I drink half of it and then give it to you. … Continue reading →

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Solution to Puzzle #61: How Many Pearls

Posted on May 10, 2014 by Alok Goyal

Many of you came back with the correct answer this time – thanks. I got the first correct from Shreya Mantripragada (9 year old, Bay Area). Also got correct answer from Anubhav Garg who explained his answer really well, Shruti … Continue reading →

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Puzzle #61: How Many Pearls

Posted on May 4, 2014 by Alok Goyal

This is a simple puzzle, and would love for children to try it! I picked this up from a new website recommended to me by my wife – Brilliant.org…has a great selection of puzzles. This specific puzzle was posted by … Continue reading →

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Solution to Puzzle #60: Hats and Survival

Posted on May 4, 2014 by Alok Goyal

I got a few correct answer, the first one came from Akash Tayal from New Jersey. Well done! Am taking the liberty of reproducing his answer directly: Out of total 8 permutations, There are 6 ways that the cap colors … Continue reading →

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