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Scales

You are given nine balls identical in appearance. Eight of the nine balls weigh the same, whilst one weighs slightly less.

You are given a set of scales and weights.

Using the scales only twice. Describe how you find the odd ball?

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not a robot
it is all about trios :) Divide into 3 groups - weight two, if they are equal then the light ball is in the third group, if not ... well you know ;) Weight two balls from the light group using approach above.
Created 28/05/09
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Author

Andrew Dodson
Since:Feb 2007

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