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 2m 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.

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