Since I not speak english very well.
I can only write short texts.
It's my first shot message in English in my life.
I recently read a puzzle about Cheryl's birthday.
That is too long to read.
There are too many superfluous words.
I can make this story shorter without loss of meaning. So.
Albert and Bernard want to know when cheryl's birthday is.
Cheryl gives them a list of 10 possible dates.
(Here, I think it is necessary to change places the dates.
It also allows to make the solution of this problem less evident.)
She gives them: 15 may, 14 july, 17 august, 14 august, 16 may, 16 july, 19 may, 17 june, 15 august, 18 june.
Next, imagine a dialogue between two boys:
Albert: I don't know when Cheryl's birthday, as Bernard.
Bernard: Now, I know when!
Albert: And so I am!
When is Cheryl's birthday?
May 2015
Vota ara! 