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?
! g: Q" \) B, _# Q+ A Z. O6 btvb now,tvbnow,bttvbA.50公仔箱論壇% G0 y: u; u5 F: R1 q! S8 I
B.60
( ?4 i4 M" J/ X/ V! A5 p* G2 T" iC.65
. A# t, a: N7 Z5 dtvb now,tvbnow,bttvbD.75 |
發表於 2007-9-11 07:38 PM
| 
