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Wrenches (Posted on 2004-07-02) Difficulty: 2 of 5
There are 4 wrenches just unpacked from a box. They all look the same. There might be one defective item which is either heavier or lighter. Fortunately there is a fifth one that is standard. If you can use a scale to weigh only 2 times, can you find out:
  1. Is there a defective wrench?

  2. If there is a defective item, is it heavier or lighter?

See The Solution Submitted by Brian Smith    
Rating: 2.8333 (6 votes)

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Scale or balance Comment 13 of 13 |
It seems like on almost every problem we have people thinking of a scale as the modern day scale that gives us a weight reading.  For these problems we are to mean scale as a balance in which you have to compare one side as heavier or lighter. Am I right? (Actually that last question is rhetorical as in the description of the problem type Weights and Scales it says a balanced scale.)

Edited on April 6, 2005, 5:22 pm
  Posted by john on 2005-04-06 17:20:38

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