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?+ [; ]& g" a$ W
A.50! R+ S2 g. e% Y$ x5 B
B.60( k: D; g% E0 t. a9 l
C.65
$ l+ L q! P3 j+ @) t2 |' J% QD.75 |
發表於 2007-9-11 07:38 PM
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