easy, one minutes i solve the problem
. u4 O/ r* [/ b& R1 W! kdivide into half, mean 6/ 6
( c% G% v, y8 R: t1 F+ @5.39.217.77take the heavier 6 ping pong! `1 l6 s5 h" M. F
divide into 3/3, take the heavier 35.39.217.77) h2 h! f; p! `! i3 h' N3 S. e
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 |