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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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Question re: needs checking/ figures can't lie | Comment 8 of 15 |
(In reply to needs checking by ant simmons)

   but liars can figure ......

   It must be wrong, since your way provides 3^3 =27 possibilities, while there are 6*6 =36 possible ordered sets.

Please check again

Ady


  Posted by Ady TZIDON on 2006-07-10 03:24:59
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