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?公仔箱論壇4 Z# p' w/ F* V6 I
A.50
9 @' `. |! n8 S5 n! ytvb now,tvbnow,bttvbB.60
( G! ^- a( q6 j( y: w" E+ x公仔箱論壇C.65
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發表於 2007-9-11 07:38 PM
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