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標題: 数学题(英文) [打印本頁]

作者: nelston    時間: 2007-9-11 07:38 PM     標題: 数学题(英文)

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?5.39.217.765 g! q/ C) u1 j+ w9 P( V
A.50
  T, B# i" g( m) L3 b8 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。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。# ^$ c) D& F) Y6 u, v7 y
C.65
* c. {6 E* Y; [7 p: I5 E4 YTVBNOW 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
作者: genzo2106    時間: 2007-9-12 01:52 PM

answer is D:75
作者: Alan8166    時間: 2007-9-12 03:37 PM

answer is D:75
作者: dokho    時間: 2007-9-16 12:13 AM

D FOR DOG
作者: ken87    時間: 2007-9-16 01:01 AM     標題: 回復 #1 nelston 的帖子

D.75 days




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