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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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Still stuck on 19 | Comment 5 of 18 |
It seems to me that no matter what weighing scheme is used, that the scenario using the most weighings will always be 19 weighings, particularly when a lot of equal weighings occur.  Certain weighing schemes will have a lower number of expected weighings, but I think there will always be a scenario requiring 19.
  Posted by Brian Smith on 2005-06-03 21:14:42
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