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0 ?2 V' `0 j' }9 r2 g |/ D& O
A.50tvb now,tvbnow,bttvb! T; G" |7 q6 Q3 D# h2 d) f4 b, I; O7 J
B.60tvboxnow.com {% O, H* q6 w
C.65tvboxnow.com, M% @& `8 y" r2 r9 d
D.75作者: genzo2106 時間: 2007-9-12 01:52 PM
answer is D:75作者: Alan8166 時間: 2007-9-12 03:37 PM
answer is D:75作者: dokho 時間: 2007-9-16 12:13 AM
D FOR DOG作者: ken87 時間: 2007-9-16 01:01 AM 標題: 回復 #1 nelston 的帖子
