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2 p7 O6 C" f9 A5 p
A.505.39.217.77 q9 G: z4 h8 b8 A( q% a+ o
B.60公仔箱論壇& ]; _1 H, O$ @0 R
C.65tvb now,tvbnow,bttvb2 G) \8 P5 x1 q) K& C1 Q
D.75 |
發表於 2007-9-11 07:38 PM
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