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Topic: Short brain teaser (Read 377 times) previous topic - next topic

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  • MikeB
Short brain teaser
Maybe this has made the rounds here but I hadn't seen it.  A friend sent this via email, which I will paste.

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  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.
(So Albert knows only the month and Bernard knows only the date.)
Then Albert and Bernard have the following conversation:

Albert: I don't know when Cheryl's birthday is, but I know that Bernard doesn't know either.
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 when is Cheryl's birthday?"
  • Last Edit: January 17, 2017, 03:46:44 PM by MikeB

Re: Short brain teaser
Reply #1
April first
Love is like a magic penny
 if you hold it tight you won't have any
if you give it away you'll have so many
they'll be rolling all over the floor

  • nesb
Re: Short brain teaser
Reply #2
Spoiler (click to show/hide)

  • MikeB
Re: Short brain teaser
Reply #3
Hmm, I don't think Albert had to rule out any month, but he had to rule out some days.

Edit - Full Member achieved!

  • nesb
Re: Short brain teaser
Reply #4
Spoiler (click to show/hide)

Re: Short brain teaser
Reply #5
I think NESB's got it.

  • MikeB
Re: Short brain teaser
Reply #6
I think what Albert said ruled out two months for Bernard?

  • nesb
Re: Short brain teaser
Reply #7
Spoiler (click to show/hide)

  • Brother Daniel
  • Global Moderator
  • predisposed to antagonism
Re: Short brain teaser
Reply #8
yeah, nesby's got it.

  • F X
  • The one and only
Re: Short brain teaser
Reply #9
May 19th
"If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man."
― Mark Twain 🔭

  • davesgoats
  • goatschwitz prisoner
Re: Short brain teaser
Reply #10
Why put the bunnies with the goats?  Because that's  closer to how they are in nature.

  • F X
  • The one and only
Re: Short brain teaser
Reply #11
July 16
"If you pick up a starving dog and make him prosperous he will not bite you. This is the principal difference between a dog and man."
― Mark Twain 🔭