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?www2.tvboxnow.com7 S+ }' g6 l: { W& j4 P
A.50
; P- w" X+ i m3 z2 x公仔箱論壇B.60公仔箱論壇9 ^: ?; [( q8 N3 b
C.65
% U U5 O, N) K6 q公仔箱論壇D.75 |
發表於 2007-9-11 07:38 PM
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