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?TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。 N) t0 e, P% o
A.50% ~9 z0 C3 @4 l, P" `
B.60
0 x6 s" V) U( i2 j公仔箱論壇C.65$ i; t7 o7 g0 A# c8 W3 V
D.75 |
發表於 2007-9-11 07:38 PM
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