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A Bag of Fake Coins (Posted on 2003-07-25) Difficulty: 3 of 5
You have N large bags of coins. All of the bags contain real 12 gram coins except for one, that one contains fake 11 gram coins.

To help you find the bag of fake coins, you have a digital scale which will give you the exact weight of any amount of coins up to 1500 grams. Any amount over 1500 grams will cause the scale to spit out a random value.

How many bags (N) can you have and still be able to tell which bag contains the fake coins if you can only use the scale three times?

See The Solution Submitted by Brian Smith    
Rating: 4.1429 (14 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
re: 182David Frazer2004-01-22 18:12:37
re: 182Brian Wainscott2004-01-15 14:04:26
182Dan Porter2004-01-15 11:35:15
possible solution?Angel2003-08-25 01:56:26
SolutionMy best so farBrian Wainscott2003-07-29 09:12:23
re(6): solution (plus one)--Still moreBrian Wainscott2003-07-29 06:42:48
Solutionre(5): solution (plus one)--Even MoreCharlie2003-07-28 15:53:01
re(4): solution (plus one)--Even MoreCharlie2003-07-28 15:50:13
No SubjectCharlie2003-07-28 15:49:36
re(3): solution (plus one)Brian Wainscott2003-07-28 13:35:23
re(2): solution (plus one)Charlie2003-07-26 10:18:22
re: solution (plus one)Bryan2003-07-25 12:55:31
re: the math... the wrong mathRich Rocket2003-07-25 11:14:48
the mathRich Rocket2003-07-25 11:11:47
SolutionsolutionCharlie2003-07-25 11:08:52
Some ThoughtsA startLewis2003-07-25 09:49:02
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