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divde the 12 balls into 3 sets of 4.
7 |- Q, t* ^9 `: J, S3 n0 }) ftvb now,tvbnow,bttvbweight any 2 sets.TVBNOW 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。  J% {5 t) |' A/ z& x! L5 u
if the 2 sets are equal, then you know the heavy one is in the thirdTVBNOW 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。3 a" u1 L* W, h! @% r
if one of the 2 is heavier, then the heavy one is in that set! V; J0 `/ L7 K  R# q! ^
then divide the 4 balls into 2.TVBNOW 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。/ q: S( m( n) s0 W
weigh them/ c1 P. a# ^7 t% I, b! Q
and divide the heavier into 1
3 |9 V4 p  }% }3 E1 U公仔箱論壇and weight them.
) J3 V9 S( ~9 B$ C5.39.217.77:88983 x weighing and get the ans.  3 j9 o8 U  K8 b) K9 w% T
in less than 15 secs.