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divde the 12 balls into 3 sets of 4. tvb now,tvbnow,bttvb# Z. }2 C! `3 D
weight any 2 sets.tvb now,tvbnow,bttvb7 a& h- ^! a: s4 }& D
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。7 i3 ^) Y, R+ s' a
if one of the 2 is heavier, then the heavy one is in that set
3 ~* `( c% A5 t+ K2 N9 l% Sthen divide the 4 balls into 2.
  B, h1 ~; F0 A% T2 Ptvb now,tvbnow,bttvbweigh them) V7 ]; o* [5 S7 V
and divide the heavier into 1
* W( p& i5 u4 R$ s0 [5.39.217.77:8898and weight them.( L4 u/ _" y3 F+ U
3 x weighing and get the ans.  公仔箱論壇: T( f2 V! x6 i) q$ y- E
in less than 15 secs.