Stressfree

1   weight 6 ping pongs with another 6 ping pongs. see which side is heavier
/ u/ s3 M3 f' ]4 @2   spilt the heavier side ping pongs in half and weight against each other5.39.217.76/ `+ Y& o* t5 k) u
3   weiht either ping pongs one on one then you will know which is the heavy one.