1 weight 6 ping pongs with another 6 ping pongs. see which side is heavier
7 f" L, K" N) ]8 b2 \& X# E( c公仔箱論壇2 spilt the heavier side ping pongs in half and weight against each othertvb now,tvbnow,bttvb3 g% i- d- }+ b% O
3 weiht either ping pongs one on one then you will know which is the heavy one. |