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?
( C9 b$ u4 n* S1 I, @4 z公仔箱論壇A.50tvb now,tvbnow,bttvb% u; R0 F# Q9 [
B.60- a/ _) F9 Y7 ~+ Q$ T- w/ s+ u4 t8 h
C.65
. V$ H8 Q2 D+ s# l/ i0 I. W/ ]5.39.217.76D.75 |
發表於 2007-9-11 07:38 PM
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