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?# @9 O: l% [4 S/ l( `) I4 H
A.50
. s- ]/ |# T, A' Z9 c公仔箱論壇B.60www3.tvboxnow.com+ b4 T7 _ b7 m3 h: |. S
C.65+ _9 H0 C ~7 K0 r
D.75 |
發表於 2007-9-11 07:38 PM
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