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?
$ F& w2 a, U) U" v# pA.50
$ w* s; f: w& y6 N公仔箱論壇B.605.39.217.76' @ e4 a6 u; s6 v+ g' x
C.65+ V' \; I& I1 Q
D.75 |
發表於 2007-9-11 07:38 PM
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