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?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。+ n4 I. Q# ^2 Y8 `9 k `* U3 p
A.50) J8 v. t$ y! {/ g" b4 N9 K
B.60tvb now,tvbnow,bttvb- k# k% H7 S/ }5 j8 \- }# y
C.65
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發表於 2007-9-11 07:38 PM
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