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L OR H (Posted on 2022-04-18) Difficulty: 2 of 5
A set of 101 coins consists of 100 genuine coins of equal weight plus one fake coin which is either
a. lighter
b. heavier
than a genuine one.

Using only equal-arm-balance, please determine in two weighings whether it is a. or b.

IMHO it is a nice puzzle, but I doubt whether the result has any practical meaning. Objections? Let my know.

Source: Leningrad Math. Competition, former USSR.

No Solution Yet Submitted by Ady TZIDON    
Rating: 3.0000 (1 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionAnother solutionBrian Smith2022-04-19 12:57:10
SolutionsolutionCharlie2022-04-18 11:43:54
SolutionSolutionBrian Smith2022-04-18 10:34:15
solnSteven Lord2022-04-18 07:36:57
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