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?- [2 f) H5 R# @: O' P. i
A.50公仔箱論壇9 o! J. N6 {, d2 O7 J
B.60tvb now,tvbnow,bttvb" Z- E/ L9 x8 }/ K R
C.65
! ?0 D$ J" g9 c) |D.75 |
發表於 2007-9-11 07:38 PM
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