12 Balls Problem

September 8, 2006 at 10:07 am 7 comments

You have 12 balls (of any kind), one ball either lighter or heavier than the other 11. A scale is provided to you but only three weighs are allowed. How can you possibly figure out which is the odd ball?

Entry filed under: Brain Teasers, Puzzle. Tags: .

Deprecated Finders in Rails 1.1.5 Plugin: state_select, generate drop down selection box for states

7 Comments Add your own

  • 1. solved  |  September 20, 2006 at 7:15 pm

    six balls on each side, take the heavier
    thres balls on each side, take the heavier
    weigh 2 of the last 3, take the heavier
    if they are even, the non-weighed on is different

    Reply
  • 2. Akhil Bansal  |  September 21, 2006 at 4:31 am

    This is not so easy.
    We don’t know about the odd ball, it may be heavier or lighter.
    Try to solve it again…Good luck

    Reply
  • 3. PWright  |  November 4, 2006 at 4:31 am

    The answer is correct. Your question asked how to determine which was the odd ball, it did not ask to determine if the odd one was lighter or heavier.

    Reply
  • 4. em  |  November 23, 2006 at 2:18 am

    The answer is wrong. six balls on each side, take the heavier

    three balls on each side. take the heavier. what if the odd ball is in the lighter pile. get the error

    good luck.

    Reply
  • 5. fatih  |  November 24, 2006 at 10:22 am

    http://www.curiouser.co.uk/puzzles/12balls.htm

    Reply
  • 6. fatih  |  November 24, 2006 at 10:24 am

    first result of the google search for “12 Balls Problem”:
    http://www.curiouser.co.uk/puzzles/12balls.htm

    Reply
  • 7. http://Hotlavarecords.ning.com/  |  December 22, 2012 at 3:56 am

    I pay a visit daily a few sites and sites to read content, except
    this blog gives quality based writing.

    Reply

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