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        riddles >> hard >> 5 Red Balls and a Green One
        
(Message started by: Joe Fendel on Nov 17^th, 2005, 6:03pm)

Title: 5 Red Balls and a Green One
Post by Joe Fendel on Nov 17^th, 2005, 6:03pm

Seeing the 12 balls riddle pop up here reminds me of this variant:

You have 5 red balls and 1 green one. All the red balls weigh the same as the green one except one of the red ones weighs 1 gram more, and perhaps one of the red ones weighs 1 gram less.

In three weighings on a standard two-bowl balance scale, can you find which red ball is heavy and which - if any - is light?