SAT Math Multiple Choice Practice Question 321: Answer and Explanation
13. When m is subtracted from n, the result is r. Which of the following expresses the result when 2m is added to s?
Correct Answer: A
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.