divde the 12 balls into 3 sets of 4. # z# n, b1 \& z
weight any 2 sets./ _( q3 I; n4 J0 f3 [7 V
if the 2 sets are equal, then you know the heavy one is in the third9 I! ^/ c A2 h) z5 u/ y# M
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。0 s; x s) s. O1 ]! d- u" I9 d1 {# H
then divide the 4 balls into 2.; f0 a4 r% V" {# e' p
weigh them公仔箱論壇$ [ d1 {$ ^& B; J
and divide the heavier into 1
1 h L( r& [" L5 n+ itvb now,tvbnow,bttvband weight them.5.39.217.77:88985 r) E$ b7 U8 y' V$ g1 \0 T( v' I
3 x weighing and get the ans. tvb now,tvbnow,bttvb. @ U9 j2 f. ?# b% D/ I$ P
in less than 15 secs. |