Thanks to Kshitij from India for sending me this problem! "A leaf is torn from a paperback novel. The sum of the numbers on the remaining pages is 15000. What are the page numbers on the torn leaf?" Notes: a leaf is a single sheet of paper, and the book is numbered starting on page 1 in the usual way. The problem comes from the 1994 Regional Mathematical Olympiad in India.

*Gary Einhorn pointed out a big mistake in my original video. Thanks to him and everyone else who helped me make this correct version:
https://www.youtube.com/watch?v=yiz4j-C5hw4&lc=UgzUf8VeZmCJWASansh4AaABAg

My blog post for this video
https://wp.me/p6aMk-7Vx

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My Books
"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.9/5 stars on 32 reviews)
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"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 4.6/5 stars on 3 reviews)
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"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.
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"Math Puzzles Volume 2" is a sequel book with more great problems. (rated 4.3/5 stars on 4 reviews)
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"Math Puzzles Volume 3" is the third in the series. (rated 3.8/5 stars on 5 reviews)
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"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.3/5 stars on 12 reviews)
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"The Best Mental Math Tricks" teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 4 reviews)
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"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 5/5 stars on 3 reviews)
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