Facebook / Kenneth Kong

Are you smarter than a Singaporean teenager?

Try your lack at the viral test question that is nagging the Internet today and figure out when Cheryl's birthday falls:

"Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible 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 do not 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 birthday is, but I know now.

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

Stumped by the brain teaser? Don't feel bad - two Metro staffers couldn't solve it, either.

The logic question went viral after a Singaporean TV host posted it on Facebook with the caption: "This question causes a debate with my wife .... and its a P5 question.#trickquestion." P5 refers to fifth grade in Singapore, but it turns out the question is actually part of aSingapore and Asian Schools Math Olympiad test paper for 14 and 15-year-olds, according to the Guardian.

If you want to know the answer and solution to the question, the Guardian has outlined how to solve the problem.

The bigger question, though, was best posed by a Guardian commenter: "Why didn't she just tell them?" That defies logic.

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