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?
) a V4 A8 X; @* k) _7 V! e( DTVBNOW 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。A.50
w9 a; G$ Z) j" {2 l# E' Btvb now,tvbnow,bttvbB.60
% U a3 j: t0 _C.65
$ M- ~$ m4 `9 t+ Y; @% X% etvb now,tvbnow,bttvbD.75 |
發表於 2007-9-11 07:38 PM
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