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?5.39.217.77:88987 K& Q% t1 y9 H/ B1 ^0 I% N" J
A.50, i$ S. ?' q: B Y: W$ h, p# D: H8 e
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。 Z3 F+ p. ?/ ?0 L: T& ~5 K
C.655 d3 d+ V/ x) U% a
D.75 |
發表於 2007-9-11 07:38 PM
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