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?' z" h- `8 G6 y: {9 u7 l
A.50公仔箱論壇0 V; B9 t9 d6 M/ A+ V1 ?
B.60TVBNOW 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。2 q" n* ^9 X- J7 X
C.65
, _4 P+ g( T; b$ bD.75 |
發表於 2007-9-11 07:38 PM
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