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# g; A2 z2 w; G& \1 C
A.50TVBNOW 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。" d1 O) i. r9 O1 R2 `% \
B.60$ t* |$ p& p- A# r; ~/ y2 o+ U
C.65
8 y: e$ W0 o2 Z+ G3 Q公仔箱論壇D.75 |
發表於 2007-9-11 07:38 PM
| 
