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?) Y4 d( Y& d! H4 E% L. P3 v3 h
A.50
3 O$ b' M$ L8 q: L3 V/ T' Vtvb now,tvbnow,bttvbB.60
6 ^- f9 y$ w+ p8 N' f公仔箱論壇C.65公仔箱論壇: U$ v; a/ C+ W, B5 X& O- x" T
D.75 |
發表於 2007-9-11 07:38 PM
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