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divde the 12 balls into 3 sets of 4.
/ I9 e0 \+ p5 P  utvb now,tvbnow,bttvbweight any 2 sets.  ]4 c0 d! r: H% D
if the 2 sets are equal, then you know the heavy one is in the third公仔箱論壇) J# i1 K' S, L8 E, ~
if one of the 2 is heavier, then the heavy one is in that set
2 W9 c& @# d6 G' m1 [' g5.39.217.77:8898then divide the 4 balls into 2.- E: K6 T2 B9 W6 E, W6 Q3 f
weigh themTVBNOW 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。/ y( g" X4 P8 G* e: M* z* }( K
and divide the heavier into 1
+ {+ N8 g" Q# K" V; ^! r5.39.217.77:8898and weight them.: |# w  n6 ]6 U! _; `& e
3 x weighing and get the ans.  公仔箱論壇' E1 s! v& H; o
in less than 15 secs.