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?7 [3 T" c5 z" N1 g# J+ ^4 M& @
A.50
1 b0 M, {: o0 k) x. b& @8 z& D5 i公仔箱論壇B.605.39.217.77! |( X6 ~# {6 \+ f: k6 Z. |
C.65公仔箱論壇2 K4 A6 r0 G8 l/ ~, N( u" ]$ J
D.75 |
發表於 2007-9-11 07:38 PM
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