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Home > Logic > Weights and Scales
One of Sixteen (Posted on 2015-12-29) Difficulty: 3 of 5
I have two sets of 8 coins. In one set the coins weigh 30g each, in the other set the coins weigh 31g each.
Unfortunately they got mixed together in one big pile of 16 coins. I want to identify one coin. It can be from either set.

(Easy) Using a balance scale, identify a coin in four weighings.

(Hard) Identify a coin in just three weighings.

See The Solution Submitted by Brian Smith    
Rating: 4.0000 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re(4): Short solution.broll2016-01-12 22:14:47
re(3): Short solution.Jer2016-01-12 10:20:32
Some Thoughtsre(2): Short solution.broll2016-01-11 23:08:08
re: Short solution.Jer2016-01-11 12:30:33
re(2): What's the problem? (and a spoiler)Steve Herman2016-01-01 10:34:53
re: What's the problem? (and a spoiler)Brian Smith2015-12-31 13:06:07
QuestionWhat's the problem? (and a spoiler)Steve Herman2015-12-31 12:16:44
Some Thoughtsre: Short solution.Ady TZIDON2015-12-31 10:49:14
Short solution.broll2015-12-30 22:09:31
re: Solution (hard)Ady TZIDON2015-12-30 17:01:14
SolutionSolution (hard)Paul2015-12-30 12:08:39
Some ThoughtsEasy does itSteve Herman2015-12-29 13:45:30
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