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?5.39.217.77( T1 Q; D8 D8 t: F
A.50公仔箱論壇# T, C% H3 Y! M1 h
B.60* E; i& U9 v; j+ b4 [7 M$ ^
C.65
8 g W. V9 [ {. `D.75 |
發表於 2007-9-11 07:38 PM
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