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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)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(3): Balanced solution | Comment 7 of 13 |
(In reply to re(2): Balanced solution by Bob)

In that case, your solution seems to be okay for both the questions.
  Posted by Arunava Dutta on 2004-07-02 11:00:30

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