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?$ H! i/ ~0 l- a
A.50公仔箱論壇, y1 T* l- }0 H1 y
B.60
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D.75 |
發表於 2007-9-11 07:38 PM
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