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?& U7 }+ F8 b% u: C# x& f4 n
A.50* d3 y: h& }1 E; s6 x5 \2 ~
B.60
! o) C+ F }8 t, z1 ntvb now,tvbnow,bttvbC.655 @' k7 n# P0 E }9 a/ e
D.75 |
發表於 2007-9-11 07:38 PM
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