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- V2 Z& t7 [- S8 y3 h& l4 m9 n
A.50
) I+ e* g4 l9 @. W, B& u公仔箱論壇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。2 {/ z% Q. |9 s2 K. D* D6 W. X
C.65公仔箱論壇' s& W1 _8 u. D9 l2 ]6 i% \
D.75 |
發表於 2007-9-11 07:38 PM
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