Stressfree

1   weight 6 ping pongs with another 6 ping pongs. see which side is heaviertvb now,tvbnow,bttvb. L" a- A7 x, H6 q4 U) c4 `5 a) H
2   spilt the heavier side ping pongs in half and weight against each other
2 s, ?- n' A5 _  c3   weiht either ping pongs one on one then you will know which is the heavy one.