2018年SAT数学备考经典练习题（2）

　　为了方便同学们的SAT数学备考，课窝考试网小编为大家收集整理了SAT数学练习题，供大家学习参考，希望能为同学们的考试提供帮助。

　　3. If x / y is an integer, which of the following statements must be true?

　　A. both x and y are integers

　　B. x is an integer

　　C. either x or y is negative

　　D. y / x is an integer

　　E. x = ny where n is an integer

　　4. What is the average of four tenths and five thousandths?

　　A. 25002

　　B. 2502

　　C. 0.225

　　D. 0.2025

　　E. 0.02025

　　3.Correct Answer: E

　　Explanation:

　　You can eliminate answer choices by picking numbers.

　　In case (A), x and y could, for example, both be equal fractions and x/y would be an integer.

　　For the same reason (B) does not have to be correct.

　　There is no reason for either of them to be negative.

　　Answer (D) does not need to be correct. Consider x/y = 6/3. Then y/x = 3/6, which is a fraction not an integer.

　　But rearranging x/y = n, we get x = ny which is therefore always true.

　　4.Correct Answer: D

　　Explanation:

　　Four tenths = 0.4

　　Five thousandths = 0.005

　　The average is (0.4 + 0.005)/2 = 0.2025

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