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?$ n& D: }6 u- c2 ?7 w! a' F& ~
A.50公仔箱論壇3 s7 v( }' V1 A% l3 ^
B.60
/ o* F7 Y0 c: V; v. I7 J! Ttvb now,tvbnow,bttvbC.65tvb now,tvbnow,bttvb0 b2 _' ~' i5 e
D.75 |
發表於 2007-9-11 07:38 PM
| 
