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?
5 f7 ^1 i8 X6 a5.39.217.77A.50tvb now,tvbnow,bttvb: _; ~, I6 S" j$ T6 V
B.60TVBNOW 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。5 P- `0 T9 n, M
C.65
1 i; d# ?% \6 W ]4 HD.75 |
發表於 2007-9-11 07:38 PM
| 
