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?公仔箱論壇 l- \1 y' w3 P1 o- w3 P1 _
A.500 o. s1 j/ {0 [( N; r+ N+ i" s
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。" }) _& I, z+ A
C.65
0 ]: w2 K5 B/ b. d, pD.75 |
發表於 2007-9-11 07:38 PM
| 
