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,bttvb0 q% R. N+ \0 k) W
A.50www2.tvboxnow.com5 q3 m( h& K0 m# m! {
B.60
7 q# G6 k& K8 vtvb now,tvbnow,bttvbC.65
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發表於 2007-9-11 07:38 PM
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