The number ofstamps that Kaye and Alberto had were in the ratio 5 : 3, respectively. After Kaye gave Alberto 10 of her stamps, theratio of the number Kaye had to the number Alberto had was 7 :5. As a result of this gift,Kaye had how many more stamps than Alberto?
(A) 20
(B) 30
(C) 40
(D) 60
(E) 90
题目翻译：kaye 和 alberto 的邮票数之比为 5比 3，当 kaye 给 alberto10 张邮票，邮票数之比为 7比 5 ，kaye 比 alberto 多几张邮票?
思路点拨：列二元一次方程，分别设 kaye 和 alberto 的邮票数为 X 和 Y。 x/y=5/3, (x-10)/(y+10)=7/5,解方程即可。
Caution!：记得求出 X 和 Y 之后要相减
If x is anegative integer, which of the following expressions has the LEAST value?
(A) x^2 -0.50
(B) x^2 - 0.51
(C) x^3 - 0.502
(D) x^3 - 0.511
(E) x^4 - 0.512
参考答案：D
题目翻译：如果 x是负整数，下面哪项最小?
思路点拔：比较。无难度。
If n = 8^11 – 8, what is the units digit of n?
A. 0
B. 1
C. 4
D. 6
E. 8
参考答案：C
题目翻译：8的十一次方减8的个位是啥。
题目全解：8 个位8， 64 个位4，...写个位。规律是8 4 2 6。8的11次方个位就是2，减去8就是4。
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