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?公仔箱論壇, ]$ s2 n0 u) z- S6 ]6 X8 s9 F
A.50
' t+ l) M% R. v+ M, S; |5.39.217.77B.60( d4 J. N5 Y9 D1 ~& f6 f
C.65. Q6 F/ t# a* f! o0 `5 X
D.75 |
發表於 2007-9-11 07:38 PM
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