SAT数学备考经典模拟题训练22

>>SAT数学模拟题：SAT数学备考经典模拟题训练22

>>SAT考试辅导

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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