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& T! Z8 v4 b* m5 I8 _% |5 J) o
A.50
1 N5 N- |% L2 n* D h- z) b& DB.60* |% m% m& K! s, @/ e% [" ]( @6 \
C.65& E7 V1 o; B8 z& Y, H) x
D.75 |
發表於 2007-9-11 07:38 PM
| 
