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9 coins prob (Posted on 2016-01-18) Difficulty: 3 of 5
There are nine silver coins marked 1, 2, 3, 4, 5, 6, 7, 8, and 9.
They are supposed to weigh the number of grams that is written on them.
One of the coins is fake and is lighter than it should be.

Find the fake coin using the balance scale twice.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
re(2): Two preplanned weighingsBrian Smith2016-01-19 10:04:00
re: Two preplanned weighingsSteve Herman2016-01-19 07:59:35
re: Two preplanned weighingsCharlie2016-01-19 07:56:20
SolutionTwo preplanned weighingsBrian Smith2016-01-18 23:22:11
SolutionOutline of a sample solutionCharlie2016-01-18 15:50:43
SolutionA solutionJer2016-01-18 12:17:21
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