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?
: f6 z! _9 p0 w( y. ATVBNOW 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。A.50 }1 ]3 E1 S: e$ q7 G' c
B.608 G* P6 _9 u& H$ q. x, [: c
C.65
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發表於 2007-9-11 07:38 PM
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