easy, one minutes i solve the problem
8 L/ |! F- S& v7 r k9 |# Fdivide into half, mean 6/ 6
% j% B2 h- a/ n5 }# Ftvb now,tvbnow,bttvbtake the heavier 6 ping pong
3 m9 Y2 f$ i" y' P/ g) Jtvb now,tvbnow,bttvbdivide into 3/3, take the heavier 3
0 d, Z8 k4 U7 X {; d; U9 b% R& Htake the the other 3 that have the equal weight, switch each to measure, the most important things is labeling the ping pong so that we can recognize |