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Twenty metal blocks (Posted on 2005-06-02) Difficulty: 3 of 5
Twenty metal blocks are of the same size and external appearance; some are aluminum, and the rest are duraluminum, which is heavier.

Using a pan balance to determine how many blocks are aluminum, what is the minimum number of weighings to be done?

See The Solution Submitted by pcbouhid    
Rating: 3.5000 (2 votes)

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  Subject Author Date
AnswerK Sengupta2009-01-09 12:42:55
Identifying all the blocks in less than 19 weighingsBrian Smith2005-06-07 21:26:13
SolutionSimilar solutionTristan2005-06-07 18:53:12
re(5): between. - to Tristan..pcbouhid2005-06-07 11:36:31
re(6): between...Tristan2005-06-07 06:28:57
re(5): between...Cory Taylor2005-06-07 00:39:05
re(4): between...Tristan2005-06-06 23:54:38
re(3): Thoughts, spoiler?ajosin2005-06-06 18:45:40
Some ThoughtshmmCory Taylor2005-06-06 18:04:25
re(2): Thoughts, spoiler?Erik O.2005-06-06 15:42:26
re(3): between...Charlie2005-06-05 22:31:36
re(2): between...Charlie2005-06-04 04:08:35
Some ThoughtsFirst basic steps to optimizationTristan2005-06-03 21:53:08
Still stuck on 19Brian Smith2005-06-03 21:14:42
re: between...Cory Taylor2005-06-03 16:10:34
re: Thoughts, spoiler?ajosin2005-06-03 02:32:08
SolutionThoughts, spoiler?Erik O.2005-06-02 20:04:42
Some Thoughtsbetween...Charlie2005-06-02 19:54:16
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