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?
( l# e4 F9 W4 O$ e公仔箱論壇A.501 ?( J `) i+ ?* O
B.60
% u% X1 T2 W/ H) ^ `C.65
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發表於 2007-9-11 07:38 PM
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