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Author Archives: Alok Goyal
Puzzle #151: Journey from 458 to 14
This is a beautiful teaser contributed by Pooja Singh, who tried this with her 9 year old. So will encourage everyone to try this, it could be a nice, 5-minute puzzle! You begin with the number 458. You are only … Continue reading
Solution to Puzzle #149: The Funny Plane Seating
Apologies for not posting the answer earlier – I was traveling last weekend. This was a difficult problem on a relative scale, and I therefore received the correct from all the die hard puzzle solvers in addition to one my … Continue reading
Puzzle #150: The Tutu Coin Puzzle :-(
This week marks a very sad week for me and for many of the regular readers of this blog. A very dear friend – Girish Tutakne (popularly known as Tutu at IIT Delhi)- passed away in a very unfortunate accident in … Continue reading
Solution to Puzzle #148: The First Black Ace
This was a bit of a counterintuitive puzzle – four people sent the correct answers – Suman Saraf, Pratik Poddar, Abhinav Jain and Karan Sharma – well done! The answer is the first card. It is a bit difficult to imagine … Continue reading
Puzzle #149: The Funny Plane Seating
A very catchy puzzle contributed by my friend and entrepreneur, Pallav Pandey – thanks Pallav! Imagine there are a 100 people in line to board a plane that seats 100. The first person in line realizes he lost his boarding … Continue reading
Solution to Puzzle #147: The “Aha” IBM Puzzle
This was a beautiful puzzle, but I did not receive as many answers as I would have liked. Correct answers came from Pratik Poddar and Suman Saraf. My younger daughter, Arushi (9), solved it with some help. Answer to all … Continue reading
Puzzle #148: The First Black Ace
Yet another wonderful puzzle from Martin Gardner’s book “The Colossal Book of Short Problems and Puzzles”. This one is a probability puzzle, and something you should try with your children. A deck of 52 playing cards is shuffled and placed facedown … Continue reading
Solution to Puzzle #146: The Proud Party Goers
Apologies for not being able to post last weekend, ended up in parenting duties more than I bargained for! This was not a very difficult puzzle, but I did not get as many solutions. Congratulations to Suman Saraf, Gautam Kumar … Continue reading
Puzzle #147: The “Aha” IBM Puzzle!
Sometimes I worry whether I will continue to get good puzzles for children, but every such time one comes across some beautiful puzzle! I came across one such yesterday in Martin Gardner’s book “The Colossal Book of Short Problems and … Continue reading
Solution to Puzzle #145: The WHO Puzzle
This was perhaps not an easy problem for children, but I got correct responses from Suman Saraf, Abhinav Jain and Pratik Poddar. The correct answer is ~0.01%, that is the probability of you having the disease is very low, even … Continue reading
Alok Goyal's Puzzles Page 