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?6 d9 S& b u# C# R! E
A.50: Q* Z) X/ R9 Y
B.60
3 @3 h- e$ w* ?( g0 g8 m; dtvb now,tvbnow,bttvbC.65 r. e5 t. f6 P5 [9 N/ X) [# e
D.75 |
發表於 2007-9-11 07:38 PM
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