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The real McCoy (Posted on 2016-01-29) Difficulty: 4 of 5
There are 9 coins that look the same but only one of them is real.
They have different weights. There are only three possibilities for their weights. Four coins are slightly heavier and four coins are slightly lighter than the real coin.
The balance scale allows any number of coins on each pan.

Find the real coin in not more than seven weighings.

How about six weighings?

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
SolutionSolutionBrian Smith2016-01-30 09:37:21
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