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?4 z Y8 p- m; F4 S
A.50公仔箱論壇% G+ y/ m8 w. F8 T3 r
B.60
3 H( x" C# b# f2 }. g0 R& Ywww2.tvboxnow.comC.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。+ v/ _9 D* k( i
D.75 |
發表於 2007-9-11 07:38 PM
| 
