1. 1st divide to half take the heavier out 8 X8 \2 a2 O* G. j# O/ v9 @+ Dtvb now,tvbnow,bttvb2. 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) ( n8 o0 z$ i( D; k% X# B, L公仔箱論壇3. Same method if is not equal on 2nd try.