there r 2 groups of worker.. skilled n partially skilled. if both group work togather they nid 30 days to finish the job. if partially skilled worker can oni do 2/3 of the skilled worker did in a day. how many days needed if only partially skilled worker is workin to finish the job?
9 r `: Y* Q1 K/ A1 t1 C公仔箱論壇A.50( @6 [; {3 Z# f3 C3 ~( A
B.60
+ r$ c: a3 w7 H0 s. S* f. f5 l公仔箱論壇C.65TVBNOW 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。9 A9 @3 H8 G b$ j6 z
D.75 |
發表於 2007-9-11 07:38 PM
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