- You are given twelve identical coins.
- You are told eleven of them weigh exactly the same but one is a fake which is either heavier or lighter than the others.
- You have set of balance scales, and you have to find which is the fake, and whether it is too heavy or too light.
- The tricky bit is that you are only allowed to use the balance scales a maximum of THREE times!

Here's what posh scales look like. |

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This solution to the Twelve Coin Balance Problem is copyright © Kjartan Poskitt 2004 and may not be reproduced in any form for commercial gain without permission. Thank you.