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Blindfolded Flipping

Rating: 2.5
July 25th, 2007

blindfold_small.gif There are 100 coins on the table. 90 of the coins have their Heads face up, the other 10 have their Tails face up. Your task is to split the coins into two groups, such that both groups contain the same number of coins with their Heads face up. You are even allowed to flip the coins…

The catch is that you cannot see the coins – you are blindfolded!

What is your strategy?

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This entry was posted on Wednesday, July 25th, 2007 at 8:40 pm and is filed under Riddles. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

4 Responses to “Blindfolded Flipping”

  1. Matan Says:
    July 25th, 2007 at 10:52 pm

    Sounds very easy, if you are allowed to rub the coins

  2. yaniv Says:
    July 25th, 2007 at 11:07 pm

    Matan, good point!

    Well, you are NOT allowed to rub the coins. Or rather, you are allowed to rub them, but both faces (heads and tails) feel the same.

    I hope the reason you wanted to rub them was indeed in order detect which face was facing upward (and not for some sort of sexual pleasure…).

    On a more serious note – none of the riddles on my site have this kind of “cheap” trick (such as rubbing the coins). I hate such riddles and will not post them. :-)

    Anyway, it is still a very easy riddle…

  3. yair Says:
    July 26th, 2007 at 10:43 am

    You did not say coins of which country, maybe Matan has a thing for the english queen? :)

  4. Ronnie Says:
    August 9th, 2007 at 11:28 pm

    this riddle was in the show hashminia :) one of the nicer ones in my opinion, although indeed 10 year-olds could solve it

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