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Balance scale problem.

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  • Balance scale problem.

    One out of nine otherwise identical balls is overweight.
    It can be identified by just two weighings on a balance scale.
    How can it be done?

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  • #2
    I am just posting this to bring the question back up to the top of the page.

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    • #3
      And the answer is...(drum roll)...Place any six balls on the scales (three on each side) to determine which group of three has the odd ball.
      If the scales balance, the odd ball is one of the three remaining on the table.
      Place two of the three balls containing the odd one on the scale, and it will tell you which is the heavy one
      If the scales balance, the heavy one is the one remaining on the table.

      Comment

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