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?; S' K2 C7 o" |# q" M
A.50
; Q3 D" R: p" Q公仔箱論壇B.60
& n! t9 _7 {! F+ f3 z: B6 K8 [公仔箱論壇C.65
6 b9 V1 t, w) V& o: UD.75 |
發表於 2007-9-11 07:38 PM
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