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: ^5 O5 b' n2 u% P6 I4 R" _, {
A.50
7 z8 N' b+ ]/ G8 PB.60
! ?# @2 ~ m5 ~$ u g) Y0 m# UC.65
" r7 z' ?5 }) n( G2 [) e9 m5.39.217.76D.75 |
發表於 2007-9-11 07:38 PM
| 
