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?tvb now,tvbnow,bttvb- F" G' l4 H4 {- D( Z" M) P, `
A.50TVBNOW 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 J: ~& y1 e; [1 I' e8 l
B.60
) x+ j- L6 M% x. D公仔箱論壇C.65. q- S8 C* e$ c9 `
D.75 |
發表於 2007-9-11 07:38 PM
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