easy, one minutes i solve the problem7 c; S. ^$ k4 I* A. e5 A( z
divide into half, mean 6/ 6
4 h& {% _* ^- m( D- k7 W4 N" l7 otake the heavier 6 ping pongtvb now,tvbnow,bttvb7 m/ Z# S0 T5 k, i# U* \, d
divide into 3/3, take the heavier 3tvb now,tvbnow,bttvb; a/ R" P( {/ [% v6 J* n
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 |