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Home > Logic > Weights and Scales
6 coins (Posted on 2016-01-13) Difficulty: 3 of 5
There are 6 coins weighing 1, 2, 3, 4, 5 and 6 grams that look the same, except for their labels. The labels are supposed to display the weights of the coins.

How can you determine whether all the labels are correct,
using the balance scale only twice?

  Submitted by Ady TZIDON    
Rating: 4.2500 (4 votes)
Solution: (Hide)
1st: 6 vs 1+2+3
iff 6 = 1+2+3 then 2nd: 3+5 vs 6+1
iff 3+5 > 6+1 ok

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Solutionre(2): short solution - spoilerCharlie2016-01-14 19:59:00
re: short solution - spoilerCharlie2016-01-13 19:29:50
Some Thoughts@ SHAdy TZIDON2016-01-13 18:06:11
Chapeau tippingSteve Herman2016-01-13 17:50:41
Solutionshort solution - spoilerAdy TZIDON2016-01-13 17:18:19
Solutioncomputer solutionCharlie2016-01-13 14:32:07
Some Thoughtscomputer attempt Charlie2016-01-13 13:42:02
re: SolutionCharlie2016-01-13 12:40:10
re: Solution / counterexampleJer2016-01-13 12:21:16
SolutionSolutionBrian Smith2016-01-13 11:26:07
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