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?

(In reply to A different solution by gregg)

i think it requies only 2 tries.
2 R and 2 B

then in next try u can tell the exact ball

Posted by atul on 2006-08-10 23:30:53