ceteriz

divde the 12 balls into 3 sets of 4.
# O' d6 d) x- g- t- P- aTVBNOW 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。weight any 2 sets.
5 D$ V1 u% K) {. d" L9 T0 kTVBNOW 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 the 2 sets are equal, then you know the heavy one is in the third
7 W- J. r4 c% Y( z; k$ C- g- ~' [0 ^if one of the 2 is heavier, then the heavy one is in that setTVBNOW 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。# c( s6 Q: o, `; R
then divide the 4 balls into 2.公仔箱論壇5 F: u' M* d- r7 F4 }" m% U3 v
weigh them公仔箱論壇9 I/ T1 ]4 k$ T5 K
and divide the heavier into 1
7 W1 |9 d$ [8 Y: n. Etvb now,tvbnow,bttvband weight them.
( _0 T) E* j6 }9 f* l  L7 B3 x weighing and get the ans.  
; _, Y/ }9 O7 R7 `- `7 @$ ytvb now,tvbnow,bttvbin less than 15 secs.