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http://www.dailymail.co.uk/sciencetech/article-3037 266/The-maths-problem-set-Singapore-teenagers-left-people-world-stumped.html

Also athttp://mothership.sg/2015/04/heres-a-supposedly-p5- logic-question-going-viral-on-facebook-that-will-melt-your-brain/

A maths problem for 14-year-olds has baffled people across the world Question uses logical reasoning and aims to sift ou t the most intelligentIt was set in the Singapore and Asian Schools Maths Olympiads (SASMO)Teaser appeared as number 24 out of 25 questions to test students By CLAIRE CARTER and RICHARD GRAY FOR MAILONLINE

It was set as a maths problem, aimed at testing the logical reasoning skills of 14-year-olds in Singapore.

But the question went viral after people across the world were left completely baffled.

The problem, which tests logical reasoning, has bee n shared thousands of times online as people have tried to pose their best explanation s of what at first appears to be an impossible question.

A maths question set for 14-year-olds has left peop le across the world baffled as they try to solve the puzzle

The test was set for 14-year-olds in the Singapore and Asian Schools Math Olympiad.

The Olympiad often features logical reasoning quest ions and are set to test top achievers.

The test asked:

Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possibl e dates.

May 15, May 16, May 19

June 17, June 18

July 14, July 16

August 14, August 15, August 17

Cheryl then tells Albert and Bernard separately the month and the day of her birthday respectively.

Albert: I don’t know when Cheryl’s birthday is, but I know that Bernard does not know too.

Bernard: At first I don’t know when Cheryl’s birthd ay is, but I know now.

Albert: Then I also know when Cheryl’s birthday is.

So when is Cheryl’s birthday?

Organisers of SASMO said the question was set to fi lter out the most intelligent of participants