ceteriz

divde the 12 balls into 3 sets of 4.
1 }2 N2 R5 \. T( Tweight any 2 sets.- A* K6 I- E6 k$ W
if the 2 sets are equal, then you know the heavy one is in the third
1 K4 p6 S. F" w- g' r! o( w. V6 pTVBNOW 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。if one of the 2 is heavier, then the heavy one is in that set
5 A4 e7 F0 h% l, N# R. w8 B9 N! r1 c, bwww3.tvboxnow.comthen divide the 4 balls into 2.
+ i0 B: |6 L3 Q2 d4 |9 I0 Gwww3.tvboxnow.comweigh them7 l9 Q1 s" z" w; L4 Q/ v
and divide the heavier into 1
* d- A- U) [+ w公仔箱論壇and weight them.
* g9 }* u* X, {. j3 D9 L公仔箱論壇3 x weighing and get the ans.  www3.tvboxnow.com/ E) s* S0 c( F3 ]' b$ J0 M+ T6 E8 l
in less than 15 secs.