# SAT Math Multiple Choice Practice Question 321: Answer and Explanation

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**Question: 321**

**13.** When *m* is subtracted from *n*, the result is *r*. Which of the following expresses the result when 2*m* is added to *s*?

A.

B.

C.

D.

E.

**Correct Answer:** A

**Explanation:**

**A** Write an equation for the first sentence.

Because none of the answer choices contain *m*, solve

for *m* in terms of *r* and *n*:

Now write an expression for what the question asks for:

Alternatively, you can substitute numbers for *n, m*, and *r*, making sure they "work," and get a numerical answer to the question.