You have 9 golf balls, 8 of which are equal in weight. The ninth is slightly
heavier then the
rest. You also have a balancing scale. Can you use this scale two times
and only two times in
order to tell which ball is heavier?
Scroll down for the answer
Separate the balls into 3 groups of 3. Place 3 balls on the left
side of the
scale and 3 balls
on the right. If they balance out, you know that the heavier ball is not
one of those 6. If one
side is heavier, you know that the heavier ball is one of those 3.