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Cheryl’s birthday (brain teaser)

puzzle

#1

This has nothing to do with wine so you can stop reading now if not interested. I know there are a few here who appreciate a brain teaser, so here is one that I was looking at this afternoon. I cannot take credit for it… it has its own Wikipedia entry under ‘Cheryl’s birthday’. Enjoy!

"Albert and Bernard just become (sic) friends with Cheryl, and they want to know when her birthday is. Cheryl gives them a list of 10 possible dates:

May 15 16 19
June 17 18
July 14 16
August 14 15 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 doesn’t know too. (sic)
Bernard: At first I don’t (sic) 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?"


#2

Got it! So much less painful than your last effort :rofl:


#3

its a good one, was the subject of debate during a wait for a delayed flight a few years ago - took me ages to work out the approach…then it came…slowly !