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,bttvb5 V& R! ~, y6 x2 F' T6 e9 n6 w. l2 f
A.50
0 m: P: A2 s9 |" s) Y% CTVBNOW 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
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D.75 |
發表於 2007-9-11 07:38 PM
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