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?
& v c" a% X! q0 c R5 |5.39.217.77A.50& A x* Z* q" W Y: D2 R: ]5 l# b8 O
B.60
2 Y8 \( x5 v1 N" |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。C.65
7 F* c9 V# n/ z; Z2 }4 Z+ F5.39.217.77D.75 |
發表於 2007-9-11 07:38 PM
| 
