maaaary

1. divide 6 and 6, both sides will not equal
% L* q5 G% W. q8 p8 W; u1 d: W# S5 p) ktvb now,tvbnow,bttvb2. take any side of the 6, divide then 3 and 3, again both sides will not equal
% }7 d* s2 D- r: U: K公仔箱論壇3. take any 2 and weigh themtvb now,tvbnow,bttvb) |  a% E4 V9 \- E* S( v
if they equal, the one left is the ball.