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?0 _0 u* K% a6 \; m" j
A.50
2 L: E6 ?' g$ eB.60
% A+ l3 L% O7 i; G公仔箱論壇C.655.39.217.77:8898* o# }% d" @7 M4 R' [
D.75 |
發表於 2007-9-11 07:38 PM
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