divde the 12 balls into 3 sets of 4.
( [! R T: K1 @- P, g% v0 g& S5.39.217.77weight any 2 sets.5.39.217.77* ]1 }2 @$ v! F1 D0 _3 a' D( M9 e* X
if the 2 sets are equal, then you know the heavy one is in the third0 q/ p; ~( b) n# D7 N
if one of the 2 is heavier, then the heavy one is in that set
! ~, {7 r% Q3 V5 Jthen divide the 4 balls into 2.4 x: w3 {+ [( Y2 D# `$ Z. h
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。5 r: ^2 m6 G! G5 } {3 j
and divide the heavier into 1
5 t8 e! r K' ~4 I- [tvb now,tvbnow,bttvband weight them.
' n& R1 J4 P& r, {2 d. W" Z" ^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。3 x weighing and get the ans. 公仔箱論壇2 p- i9 }" s" |2 p9 ^: L3 r0 e/ M3 l
in less than 15 secs. |