Quote Originally Posted by arkana
Answer to #8 in white:

First weigh 6 coins (three each side), if the scale doesnt tip then weigh the remainding 2 coins (1 each side) to find the heavier one.

If the scale tips then we know the counterfeit coin is one of the three coins that were the heaviest. Put one of these three coins aside and put the other two coins on the scale (1 each side). If the scale tips then the heavier one is the counterfeit one, otherwise it is the coin you put aside.
i got it another way. tho this is more exact