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Cheryl's b-day (Posted on 2015-09-24) Difficulty: 3 of 5
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 or 16 or 19.
June: 17 or 18.
July: 14 or 16 .
August: 14 or 15 or 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.
Bernard: At first I did not 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?"

  Submitted by Ady TZIDON    
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Solution: (Hide)
http://www.theguardian.com/science/alexs-adventures-in-numberland/2015/apr/13/how-to-solve-albert-bernard-and-cheryls-birthday-maths-problem

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionsolutionCharlie2015-09-24 10:16:36
SolutionProcess of Elimination (spoiler)Steve Herman2015-09-24 10:01:10
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