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?公仔箱論壇) t; h8 z# Q5 b: X s5 Q
A.50
{. A1 @$ t; n% W% U) D' tB.60
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D.75 |
發表於 2007-9-11 07:38 PM
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