Tag Archives: logic puzzles

Solution to Puzzle #104: Togglers Puzzle

Posted on July 4, 2015 by Alok Goyal

Apologies for an inordinate delay in posting the answer to this puzzle. I was on vacation with children over the last 3 weekends 🙂 This was a very interesting, though a slightly difficult puzzle. I got 4 correct answers from … Continue reading →

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Puzzle #104: Togglers Puzzle

Posted on June 7, 2015 by Alok Goyal

Another beautiful puzzle this time – one from my nephew Karan Sharma, originally seen from Khan Academy, though available at other places as well. This is a truth-liar problem. Here it goes: You are in a room with five people. … Continue reading →

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Solution to Puzzle #99: World’s Most Famous Puzzle Currently

Posted on April 26, 2015 by Alok Goyal

This was a relatively simple puzzle and I received many correct solutions to this puzzle. Ritesh, one of my colleagues, was the first one to respond in literally 30 seconds. Many others gave correct answers that include – Utkarsh (another … Continue reading →

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Puzzle #99: World’s Most Famous Puzzle Currently!

Posted on April 18, 2015 by Alok Goyal

I am simply amazed how one single puzzle has proliferated across the social media in the last 10 days – the puzzle from Singapore, popularized by Alex Bellos’ blog in The Guardian. Many of you would have seen this, but … Continue reading →

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Solution to Puzzle #98: How Many Days to be Disease Free

Posted on April 18, 2015 by Alok Goyal

Thanks again to Pallav for the puzzle – as I mentioned earlier, one of my favorites and a wonderful concept of mathematical induction to be taught to children. Only two people sent correct answers – Mohit Khare and Pratik Poddar … Continue reading →

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Puzzle #98: How Many Days to be Disease Free

Posted on April 12, 2015 by Alok Goyal

Thanks to Pallav for yet another very interesting, and in this case, a classic puzzle. My 11th grade chemistry teacher, Mr. Gopinath, had given it to me, and I love this puzzle. Here it goes: In a village of 100 … Continue reading →

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Solution to Puzzle #97: Pirates and Gold Coins – Part II

Posted on April 12, 2015 by Alok Goyal

I did not get as many correct answers to this puzzle as I had expected. Many people gave an answer which can work, but only Karan Sharma, my nephew, gave me a full answer. Other people to give any correct … Continue reading →

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Puzzle #97: Pirates and Gold Coins – Part II

Posted on April 5, 2015 by Alok Goyal

I had posted a puzzle earlier (Puzzle #3) – https://alokgoyal1971.com/2013/02/10/puzzle-3-five-pirates-and-looted-gold-coins/. This puzzle is an extension of the same puzzle, and also attributed to the same family – this time to Alok Mittal from his Mathematical Circles group. Original puzzles goes as … Continue reading →

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Solution to Puzzle #94: Two Eggs and a Building

Posted on March 8, 2015 by Alok Goyal

Again an overwhelming response to the puzzle, that I thought was a difficult one. But some of the die hards sent an answer immediately. Only two people gave a fully correct answer – Suman Saraf, whose 10 year old also could … Continue reading →

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Puzzle #94: Two Eggs and a Building

Posted on March 1, 2015 by Alok Goyal

This is another beauty of a puzzle from Gurmeet’s puzzle collection at gurmeet.net/puzzles/, thanks Gurmeet! With two eggs and a building with 100 floors, what is the optimal strategy for finding the lowest floor at which an egg will break when … Continue reading →

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