1 weight 6 ping pongs with another 6 ping pongs. see which side is heavier
" h5 N& s7 l# r+ q, L- p; R公仔箱論壇2 spilt the heavier side ping pongs in half and weight against each othertvb now,tvbnow,bttvb) u5 a; S- O$ p" U5 b6 p i3 j
3 weiht either ping pongs one on one then you will know which is the heavy one. |