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?
' ~2 R1 C8 F2 r% M: cA.50
& r6 d0 I, y, k" o/ i! QB.60# Y& t! n% w- S& x4 P
C.654 P# ^8 ]( O) {0 U8 S& F/ J
D.75 |
發表於 2007-9-11 07:38 PM
| 
