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?9 Z5 }" p' X: }! G$ s4 J6 X7 h. g. X
A.50
9 Q' s2 y0 k1 o4 i: kB.60* A+ }4 I x) {$ T3 S$ U. Y$ b8 ~
C.65公仔箱論壇1 V+ [% @4 s% ^1 m& s
D.75 |
發表於 2007-9-11 07:38 PM
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