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Can you solve it? The math problem that baffled people around the world

The maths problem, aimed at
testing the logical reasoning skills of 14-
year-olds in Singapore, has left the world baffled after question went viral online.
Check the question below and see if you can solve it.

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 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
birthday is, but I know now.
Albert: Then I also know when Cheryl’s
birthday is.
So when is Cheryl’s birthday?

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