Stressfree

1   weight 6 ping pongs with another 6 ping pongs. see which side is heavier
: T1 t7 s" B2 R- u/ T公仔箱論壇2   spilt the heavier side ping pongs in half and weight against each other公仔箱論壇0 h- W+ c( z6 q/ v
3   weiht either ping pongs one on one then you will know which is the heavy one.