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?0 ?! Y9 _4 X5 W. }' p: n0 ?
A.50公仔箱論壇$ M9 E7 L) p9 ]) r9 l
B.60tvb now,tvbnow,bttvb9 G6 @8 e6 s2 @" D$ r
C.65
) J( `9 A7 A& zTVBNOW 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。D.75 |
發表於 2007-9-11 07:38 PM
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