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? Z3 a+ U- Z9 b- \( _- m
A.50公仔箱論壇1 r8 b0 m: ^1 f& i! S
B.605 v, ?# |% w+ K8 N3 C) D* z
C.65
+ e5 D4 K! Z1 P" ~1 b) gtvb now,tvbnow,bttvbD.75 |
發表於 2007-9-11 07:38 PM
| 
