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?) b/ `1 Z) ~$ g0 C! i8 }
A.50
8 A* S* w. O: _. U0 B# \6 Q公仔箱論壇B.60tvb now,tvbnow,bttvb# t7 w# H% f# S$ ]
C.65$ ^/ w1 }' f+ y3 k1 j, c2 V, Q
D.75 |
發表於 2007-9-11 07:38 PM
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