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Home > Logic > Weights and Scales
One out of ninety (Posted on 2013-12-17) Difficulty: 3 of 5
You are presented with a set of 90 coins, appearing identical.
Actually, 89 of them are identical, but one has a different weight.
Using balance scales you have to find the odd coin,
paying $10 each time you use the scales.

What is the maximal (i.e. the worst case) cost to accomplish it?

See The Solution Submitted by Ady TZIDON    
Rating: 4.0000 (1 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: One out of One Hundred Twenty! | Comment 6 of 7 |
(In reply to One out of One Hundred Twenty! by Brian Smith)

Brilliant and elegant!  Great work!
  Posted by Steve Herman on 2015-12-18 20:18:01

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