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?1 T' U' N+ Q [# ~3 E5 u' H7 W
A.50
) _# a+ u, c" g/ \0 E% h公仔箱論壇B.60
4 H" u: h: B/ Z* }# e& |& zC.65
/ n6 I5 K: @, k! Z: ZD.75 |
發表於 2007-9-11 07:38 PM
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