There are 12 balls, eleven of equal weight and one that is heavier or lighter than the others. You are given a balance scale. How would you find the off-weight ball in just three weighings?
help???????
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How would you find the off-weight ball in just 3 weighings? 
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How would you find the off-weight ball in just 3 weighings?
by babyZ on Sun Oct 04, 2009 12:45 pm
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by stapel_eliz on Sun Oct 04, 2009 5:08 pm
The Math Forum has a great archive of exactly this sort of exercise. Their solution involves coins, but the process is exactly the same for balls or any other objects. 
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stapel_eliz - Posts: 1705
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