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?
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B.60
4 B, K2 T. _) u" |C.65
! S3 Z1 w: l% Z4 S* V1 zD.75 |
發表於 2007-9-11 07:38 PM
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