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?2 B4 n" F9 P2 y
A.50, Z+ W8 T* c4 ~" w# U& j
B.60公仔箱論壇& Y1 x. x V: l4 k1 Q# s* N
C.655.39.217.76/ ~0 E+ q" [( R7 @/ j
D.75 |
發表於 2007-9-11 07:38 PM
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