When is Cheryl's birthday? (Best Singapore Math Explanation)

If you're looking for the best explanation to the solution for "Cheryl's birthday", the Math Question that has gone viral, then look no further.

Cheryl's birthday Math Question / Puzzle has gone viral and it has gotten Singapore asking when is Cheryl's birthday? Probably because they think it's a Primary 5 question but actually, it's a maths olympiad question.

Albert and Bernard just become 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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