sky888

put six on each side first
7 x& e# V! @' n; i# V5 r3 {tvb now,tvbnow,bttvb
$ i. l; M6 w- X* O) L0 Z公仔箱論壇from the heavier six, split it to three on each side
4 Q  B: m# f; O& k+ G  ~$ i# {% e$ x% {tvb now,tvbnow,bttvb# `0 N7 n) ]/ Y
then there is three left, put one on each side, if one is heavier then that is it, if they are balanced then last one is heavy one