This 'Simple' Puzzle Once Stumped 96% of America's Top Math Students
https://www-newz.blogspot.com/2015/04/this-puzzle-once-stumped-96-of-america.html
Twenty years ago, this puzzle appeared on a test administered to top-tier math students from 16 countries around the world. Only 10% of test takers got it right. In the U.S., only 4% managed to provide a correct response. Can you find the “simple” solution that so many intelligent students missed?
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