1. 1st divide to half take the heavier out% e7 c; J. o% X# c; c
2. 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) : | q7 u2 f" Z) `: |$ t: l公仔箱論壇3. Same method if is not equal on 2nd try.