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 Z9 V. L' p' X( t0 X5 y; B
A.50" ~. h! f- }! B9 I7 F
B.60
5 w5 e/ k5 ], r9 ?/ l1 T: J: _公仔箱論壇C.65' W9 Q3 N/ l9 f# X
D.75 |
發表於 2007-9-11 07:38 PM
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