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Which is Which (Posted on 2006-07-07) Difficulty: 3 of 5
You have six balls - three red and three black. All the red balls weigh differently, i.e. one of them is heavy, the other medium, and the third light. Each red ball has a black twin of the same weight. A heavy and a light ball put together weigh as much as two medium balls.

What is the least number of weighings required on a balancing scale to determine which is which?

No Solution Yet Submitted by Salil    
Rating: 3.0000 (2 votes)

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re(2): A different solution | Comment 14 of 15 |
(In reply to re: A different solution by atul)

Not sure what you mean.  For example, if you have

1 red heavy and 1 red light and weigh it against 1 black heavy and 1 black light then the scale will balance.

Then, if you pick up the 1 red heavy and 1 black heavy then it will balance the next try.  However, you don't know which ball is which because the scale always balances.

  Posted by gregg tsujimoto on 2006-08-11 19:30:37
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