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Twelve Coins and a Broken Scale (Posted on 2005-06-24) Difficulty: 4 of 5
You have 12 coins, six weigh 24 grams and six weigh 25 grams. You also have the broken scale from Five Weights and a Broken Scale.

Sort the 12 coins into the group of 24g coins and the group of 25g coins using that broken scale no more than 9 times.

See The Solution Submitted by Brian Smith    
Rating: 3.3333 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Solution, I think. | Comment 3 of 8 |
(In reply to re: Solution, I think. by Federico Kereki)

The scale is broken. The 24g coin and the 25g coin will appear to be equal. It takes a difference greater than 1.5g to register inequality. You need at least two coins on both sides of the scale to discover a heavier weight. 

Solving this puzzle will take an exacting case-by-case approach id done manually, or a computer program might discover it.


Edited on October 20, 2007, 6:51 pm
  Posted by Penny on 2005-06-28 14:13:53

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