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Two false coins (Posted on 2005-03-25) Difficulty: 3 of 5
You have ten coins, but two are fake, and weigh a little less. How many times do you have to use a two arm scale, in order to pick out the two fakes?

See The Solution Submitted by Federico Kereki    
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Solution re: Guess | Comment 7 of 11 |
(In reply to Guess by David)

Actually, I correct myself, supposing that these two coins that pull on the first draw are not the fakes, then you draw a fake, you would still have to find the other fake.  That would take at least one more turn, so minimum is 3 weighings.
  Posted by David on 2005-03-28 05:37:24

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