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?
6 [# s, J( z8 z+ Y3 n" v+ G, gA.50
0 g2 ~# ~( f6 I8 ~TVBNOW 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。B.60
7 v+ o6 W/ ~! I' ^4 E. hC.65% r- p1 Q9 ^5 U8 F; _' j
D.75 |
發表於 2007-9-11 07:38 PM
| 
