Īll Albert knows is the month, and every month has more than one possible date, so of course he doesn't know when her birthday is. This is how Alex Bellos in the UK newspaper The Guardian presented its outcome: Īlbert: I don't know when Cheryl's birthday is, but I know that Bernard doesn't know. The answer can be deduced by progressively eliminating impossible dates. The candidate dates may be written in a grid: īernard: At first I don't know when Cheryl's birthday is, but I know now.Īlbert: Then I also know when Cheryl's birthday is. Cheryl gives them a list of 10 possible dates:Ĭheryl then tells Albert and Bernard separately the month and the day of her birthday respectively.Īlbert: I don't know when Cheryl's birthday is, but I know that Bernard doesn't know too. The question is number 24 in a list of 25 questions, and reads as follows: Īlbert and Bernard just became friends with Cheryl, and they want to know when her birthday is. 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". According to SASMO's organisers, the quiz was aimed at the top 40 per cent of the contestants and aimed to "sift out the better students". The competition was held on 8 April 2015, with 28,000 participants from Singapore, Thailand, Vietnam, China and the UK. Kong posted the puzzle following a 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 meant for 14-year-old students, a fact later acknowledged by Kong. The SASMO version of the question was posted on Facebook by Singapore television presenter Kenneth Kong on April 10, 2015, and quickly went viral. Henry Ong, the Founder of SASMO was interviewed by Singapore's Mediacorp program FIVE hosts Chua En Lai and Yasmine Yonkers.Īn early version of Cheryl's Birthday, with different names and dates, appeared in an online forum in 2006. It went viral in a matter of days and also hit national television in all major cities globally. Written by Dr Joseph Yeo Boon Wooi of Singapore's National Institute of Education, the question was posed as part of the Singapore and Asian Schools Math Olympiad (SASMO) in 2015, and was first posted online by Singapore television presenter Kenneth Kong. The objective is to determine the birthday of a girl named Cheryl using a handful of clues given to her friends Albert and Bernard. " Cheryl's Birthday" is a logic puzzle, specifically a knowledge puzzle.
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