A math teacher is buying wooden letters. Each letter has a price, but different letters can have different prices. A shopkeeper explains the cost of a few words: ONE costs $1, TWO costs $2, ELEVEN costs $11. The math teacher wants to buy TWELVE. How much does TWELVE cost? Watch the video for the solution.

My blog post for this video
https://wp.me/p6aMk-59d

Sources and further reading
http://blog.tanyakhovanova.com..../2017/03/the-hidden-
https://www.reddit.com/r/mildl....yinteresting/comment
https://twitter.com/neiltyson/....status/1445940058528
http://old.qi.com/talk/viewtopic.php?t=34230&start=0&sid=3f281a47a14fd758ff5566d0ca5c3584
https://mathjokes4mathyfolks.w....ordpress.com/2011/05
https://wordsmith.org/board/ubbthreads.php?ubb=showflat&Number=196932

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My Books

"The Joy of Game Theory" shows how you can use math to out-think your competition. (rated 3.8/5 stars on 27 reviews) https://www.amazon.com/gp/product/1500497444

"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 5/5 stars on 2 reviews) https://www.amazon.com/gp/product/1523231467/

"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. https://www.amazon.com/gp/product/1517421624/

"Math Puzzles Volume 2" is a sequel book with more great problems. (rated 5/5 stars on 3 reviews) https://www.amazon.com/gp/product/1517531624/

"Math Puzzles Volume 3" is the third in the series. (rated 5/5 stars on 3 reviews) https://www.amazon.com/gp/product/1517596351/

"40 Paradoxes in Logic, Probability, and Game Theory" contains thought-provoking and counter-intuitive results. (rated 4.7/5 stars on 12 reviews) https://www.amazon.com/gp/product/1517319307/

"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) https://www.amazon.com/gp/product/150779651X/

"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) https://www.amazon.com/gp/product/1500866148/