Question:

Albert and Bernard just became friends with Cheryl, and they want to know when her birthday is. So 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 didn’t know when Cheryl’s birthday is, but I know now.

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

So can you Guess when is Cherly’s birthday ?

Answer: