Thanks to León from Argentina for suggesting this problem! It comes from the 1995 Mathematical Olympiad, and I will explain how you could solve it in your head in 1 minute.

Amazon's hanging cable problem:
https://youtu.be/l_ffdarcJiQ

Hardest easy geometry problem:
https://youtu.be/HQc-54hQ8kw

My book "The Best Mental Math Tricks (rated 4.8/5 stars on 5 reviews)
http://amzn.to/18maAdo

Picasso joke
https://www.davidairey.com/pic....asso-and-pricing-you
https://quoteinvestigator.com/2018/01/14/time-art/

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My Books
"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 4.0/5 stars on 37 reviews)
http://amzn.to/1uQvA20

"The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias" is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 3.5/5 stars on 4 reviews)
http://amzn.to/1o3FaAg

"Math Puzzles Volume 1" features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.4/5 stars on 13 reviews.
http://amzn.to/1GhUUSH

"Math Puzzles Volume 2" is a sequel book with more great problems. (rated 4.5/5 stars on 6 reviews)
http://amzn.to/1NKbyCs

"Math Puzzles Volume 3" is the third in the series. (rated 4/5 stars on 6 reviews)
http://amzn.to/1NKbGlp

"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.4/5 stars on 13 reviews)
http://amzn.to/1LOCI4U

"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.8/5 stars on 5 reviews)
http://amzn.to/18maAdo

"Multiply Numbers By Drawing Lines" This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 4.3/5 stars on 6 reviews)
http://amzn.to/XRm7M4

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