1. divide 6 and 6, both sides will not equalwww2.tvboxnow.com8 X3 P' f- Z, i0 U
2. take any side of the 6, divide then 3 and 3, again both sides will not equalwww2.tvboxnow.com8 r5 Y' M, _# r; \
3. take any 2 and weigh them% x' ]; i# A: ~4 Z3 \
if they equal, the one left is the ball.