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" S; {, S; u: T' S8 C& F& Q
A.50tvb now,tvbnow,bttvb; \! S% x0 G% ~1 R
B.60
$ \0 M# V9 o v# `& K公仔箱論壇C.655.39.217.77:8898( n" u" M: l9 l4 Q) v
D.75 |
發表於 2007-9-11 07:38 PM
| 
