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Twenty metal blocks (Posted on 2005-06-02)

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
Puzzle Answer	K Sengupta	2024-03-19 03:15:17
Answer	K Sengupta	2009-01-09 12:42:55
Identifying all the blocks in less than 19 weighings	Brian Smith	2005-06-07 21:26:13
Similar solution	Tristan	2005-06-07 18:53:12
re(5): between. - to Tristan..	pcbouhid	2005-06-07 11:36:31
re(6): between...	Tristan	2005-06-07 06:28:57
re(5): between...	Cory Taylor	2005-06-07 00:39:05
re(4): between...	Tristan	2005-06-06 23:54:38
re(3): Thoughts, spoiler?	ajosin	2005-06-06 18:45:40
hmm	Cory Taylor	2005-06-06 18:04:25
re(2): Thoughts, spoiler?	Erik O.	2005-06-06 15:42:26
re(3): between...	Charlie	2005-06-05 22:31:36
re(2): between...	Charlie	2005-06-04 04:08:35
First basic steps to optimization	Tristan	2005-06-03 21:53:08
Still stuck on 19	Brian Smith	2005-06-03 21:14:42
re: between...	Cory Taylor	2005-06-03 16:10:34
re: Thoughts, spoiler?	ajosin	2005-06-03 02:32:08
Thoughts, spoiler?	Erik O.	2005-06-02 20:04:42
between...	Charlie	2005-06-02 19:54:16

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