Cheryl Is a Good Logic Puzzle Maker and a Bad Friend
Via NY Times:
Originally, Mr. Kong said this was a problem inflicted on fifth-graders, leading to hand-wringing that Singapore children were way better at math than everyone else in the world and worries that Singapore children were being mentally abused with convoluted logic at a young age.
It turned out the problem actually came from a math olympiad test for math-savvy high school-age students.
If you're having trouble here's the answer.
And here's the post that started it all.
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