easy, one minutes i solve the problem
* V9 K; T% H1 O5 S3 m6 Bdivide into half, mean 6/ 6
. C- m/ M7 k, r1 Ptake the heavier 6 ping pong
) K+ E" Z- E* P8 B8 |" f# Q公仔箱論壇divide into 3/3, take the heavier 3
7 `0 s D9 O) N) a! W+ ctake 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 |