This math question meant for 7-year-olds has everyone stumped

来源: 2017-05-17 08:49:31 [旧帖] [给我悄悄话] 本文已被阅读:

https://www.aol.com/article/news/2017/05/17/this-math-question-meant-for-7-year-olds-has-everyone-stumped/22095360/