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Cheryl's Birthday
Cheryl's Birthday is the unofficial name given to a mathematics brain teaser that was asked in the Singapore and Asian Schools Math Olympiad, and was posted online on 10 April 2015 by Kenneth Kong. It went viral in a matter of days. The quiz asked readers to determine the birthday of a girl named Cheryl using a handful of clues given to her friends Albert and Bernard.
==Origin==
The question was posted on Facebook by Singapore TV presenter Kenneth Kong.〔 The posting drew thousands of comments, including several humorous ones—many aimed at Cheryl who apparently didn't want to disclose her birthday straight away. Kong posted it out of his debate with his wife, and he incorrectly thought it to be part of a mathematics question for a primary school examination, aimed at 10- to 11-year-old students, although it was actually part of the 2015 Singapore and Asian Schools Math Olympiad (SASMO) meant for 14-year-old students, a fact later acknowledged by Kong. The competition was held on 8 April 2015, with 28,000 participants from Singapore, Thailand, Vietnam, China and the UK. According to SASMO's organisers, the quiz was aimed at the top 40% of the contestants and aimed to "sift out the better students". SASMO's executive director told the BBC that "there was a place for some kind of logical and analytical thinking in the workplace and in our daily lives".〔(BBC News, 14 April 2015 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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