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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 (3 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re: Less trivial boundary | Comment 3 of 15 |
(In reply to Less trivial boundary by Steve Herman)

I agree that you can sort the red and black balls in five weighings. 

But, as yet, I also have not concluded that five is the minimum.


  Posted by Dej Mar on 2006-07-07 16:06:41
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