1. 1st divide to half take the heavier out . f+ G' Z5 C. o8 V# @- z c* D2. 2nd take 4 balls out of 5 divide 2 groups to get the heavier out. (if is equal thn the remain is the one u looking for) " b/ D. M# J1 @7 N: B; j/ g! S公仔箱論壇3. Same method if is not equal on 2nd try.