做prep时遇到几道不懂得数学题，请大牛们帮忙解答，万分谢谢！

王紫矜 · 发表于 2013-11-2 21:10:49

第一题：A certain library assesses fines for overdue books as follows. On the first day that a book is overdue, the total fine is $0.10. For each additional day that the book is overdue, the total fine is either increased by $0.30 or doubled, whichever results in the lesser amount. What is the total fine for a book on the fourth day it is overdue? 0.6 0.7 0.8 0.9 1.0
答案是0.7

第二题：If x, y, and z are integers greater than 1, what is the value of x+y+z?
(1) xyz=70
(2) x/yz=7/10
答案是A

第三题：
Stock  Number of shares
V  68
W  112
X  56
Y  94
Z  45
The table shows the number of shares of each of the 5 stocks owned by Mr. Sami. If Mr. Sami was to sell 20 shares of Stock X and buy 24shares of Stock Y, what would be the increase in the range of the numbers of shares of the 5 stocks owned by Mr. Sami?  4  6  9  15  20
答案是15

请各位高手指点！跪谢！

lightdust1210 · 发表于 2013-11-3 00:59:07

(1)0.1+0.2+0.2+0.2 (2)xyz都是正整数分解70=2*5*7 得出xyz为257 （3）考点在in the range of上看来数学主要靠读懂题意啊共勉

做prep时遇到几道不懂得数学题，请大牛们帮忙解答，万分谢谢！

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