easy, one minutes i solve the problem
" I+ `6 v" U0 M' vdivide into half, mean 6/ 6& V( g* f# Z6 o2 O
take the heavier 6 ping pongtvb now,tvbnow,bttvb& Y6 C) |7 t- k* o
divide into 3/3, take the heavier 3
* W0 F) h1 i1 ]* l$ O2 a, Utake 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 |