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prep数学求解答

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发表于 2012-10-29 15:22:52 | 显示全部楼层 回帖奖励 |倒序浏览 |阅读模式
1.A certain library assesses fines for overdue books as follows. On the first day that a book is overdue , the total fine is 0.1.For each additional day that the book is overdue, the total fee is either increased by 0.3 0r doubled, while other residents in the less amount, what is the total fee for a book on the fourth day it is due
答案是0.7  我做得是0.8 主要是doubled怎么理解
2.On a certain sight-seeing tour, the ratio of the number of the women to the number of the children was 5 to 2, what was the number of men on the sight-seeing tour?
1)on the sight-seeing tour , the radio of the number of the children to the number of the men was 5 to 11
2)the number of women on the sight-seeing tour was less than 30
答案是C 我选的是E

谢谢啊!
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