easy, one minutes i solve the problem+ r/ c& J1 A, b8 P# X& m
divide into half, mean 6/ 6
0 @5 n9 ^1 H( V8 w( T4 x2 a& Ttake the heavier 6 ping pongtvb now,tvbnow,bttvb9 U+ |0 x l1 ^3 E2 V; z9 O7 U. l
divide into 3/3, take the heavier 3 \: f1 J& s! i6 n; b6 l9 K
take 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 |