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?
: l& u A- X9 o. Q公仔箱論壇A.50* X/ G+ `6 p% g1 \5 I
B.60
7 V1 a4 h3 \3 o. e9 H! oTVBNOW 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。C.65
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發表於 2007-9-11 07:38 PM
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