1. 1st divide to half take the heavier out * [8 M3 I( ?9 f5 A1 t公仔箱論壇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) + ?0 O5 `6 U2 `: e f- a# C1 ^tvb now,tvbnow,bttvb3. Same method if is not equal on 2nd try.