Cheryl cole birthday

When, exactly, is Cheryl’s birthday?

Albert and bernard became friends with cheryl

A charming logic puzzle led to much hand-wringing over this question in the past week. A prompt about two men, Albert and Bernard, trying to figure out a woman’s birth date with limited information spread from a Singapore math competition to social media around the world.

Below, read the original puzzle, then watch our video explanation of the solution.

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?

Here’s how to figure it out, with one simple chart:

See?

That wasn’t so bad.

And i

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