Brain Teaser





The problem reads:

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?



Where is Honest Brother?  He can do this with his eyes closed.  


Last edited by Kocolicious
Original Post

  Okay.  The answer is July 16th for some crazy ass reason.  I tried this in terms of elimination...and then I tried to do the abstract algebra thingy....that didn't work-which is why I hate math.  But!  Nevertheless, that's the answer.  The logically reasoning for the answer didn't sit well for me cuz it's all does one knows what the other is thinking based on what is said?  For example:   I don't know when Cheryl's birthday is but I KNOW that Bernard does not know too.  How can YOU get the answer from that?    Drove me crazy.  As why the Math field is NOT....lemme repeat is NOT my cup of tea or for better word not my field of choice.    However!  It was a great challenge---and I love challenges.  But!

Last edited by Kocolicious

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