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?
}- U {0 R, c* u公仔箱論壇A.50
! i1 \- m0 e( j6 G; p3 h Y公仔箱論壇B.60
3 t z# }; r* ~. y" o6 ?C.65
( Z! [: _8 |; lD.75 |
發表於 2007-9-11 07:38 PM
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