1. divide 6 and 6, both sides will not equal5 C+ f0 W7 w: S
2. take any side of the 6, divide then 3 and 3, again both sides will not equal @4 E0 e9 H" c4 Z3 P `公仔箱論壇3. take any 2 and weigh them " {6 Y5 d7 u: M! ^- l4 d j2 Vif they equal, the one left is the ball.