There are 8 balls and one of them is slightly heavier than the rest. You can only use the weight comparison scale twice.
How do you find the heavier one?

Put 3 balls on each side. If one is heavier, then take those three, hold one in your hand and weigh the remaining of the 3 balls(one on each side) If one is heavier then there you go! If they are same, then the one you were holding in your hand is the one. Back to the first step. Ok if the 3 balls are equal, then take those six balls out and weigh the remaining two.


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