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1   weight 6 ping pongs with another 6 ping pongs. see which side is heavier
( N4 [: C6 c. m8 o- _9 x' a  _% NTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。2   spilt the heavier side ping pongs in half and weight against each other
3 Z0 k% J; m0 r' U% R6 P: a3 ]$ C" Y3 |tvb now,tvbnow,bttvb3   weiht either ping pongs one on one then you will know which is the heavy one.