You have 12 billiard balls. All but one of the billiard balls are of equal weight. The one odd bal :) is either lighter or heavier. You do not know which. You have 3 (balance) scale weighings to determine not only which all is the odd one but also whether it is lighter or heavier. You must be able to give logic for all possibilies.

Good Luck. :) ( Sorry again about the other post, Gerald. ) Mark, if you need any hints, just let me know.