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2 c. k4 D% u3 N' H1 s5 `
A.50tvb now,tvbnow,bttvb0 J0 p# r* q' c5 K4 d0 T7 q" C
B.60
3 n0 C% i* o* e2 Z7 P% c8 |: Etvb now,tvbnow,bttvbC.65
! Z& L' m( Y/ D: U) t9 F; E& pD.75 |
發表於 2007-9-11 07:38 PM
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