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?
+ J9 \/ P& h8 |9 nTVBNOW 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。A.50
: n! d! A8 f; o2 {B.60* T: P. N$ y, a5 \0 R
C.65
+ V$ ~/ ^- P) X9 M% sD.75 |
發表於 2007-9-11 07:38 PM
| 
