Yellow gem Gem 13: The Twelve Coins PuzzleLink back to Home Page...
Solution by Moshe Shweiger

  The Twelve Coins Puzzle  

We have twelve coins. They all weigh exactly the same,
except for one which is fake. It is either heavier or lighter
than the other eleven. Determine in three weighings of a
balance scale which one of the coins is the fake one and
whether it is heavier or lighter than the other eleven.

The Twelve Coins Puzzle Illustration

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