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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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Comments: ( Back to comment list | You must be logged in to post comments.)
re: Two preplanned weighings | Comment 4 of 6 |
(In reply to Two preplanned weighings by Brian Smith)

If 1+3+7 is weighted against 2+5+6, the 2+5+6 is sure to go down (be heavy) as its total supposed weight is 13, as opposed to 1+3+7's total of 11, even if one of 2,5,6 is the light coin by 1 or close to 2 grams.


The good coins are not of equal weight, but agree with their markings.

  Posted by Charlie on 2016-01-19 07:56:20
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