SSAT Math Question 305: Answer and Explanation

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Question: 305

9. Let m represent the length of a rectangle. Which expression would represent the perimeter of this rectangle if the width is 9 more than the length?

A. m² + 9m
B. m² – 9
C. 2m + 9
D. 4m – 18

Correct Answer: E

Explanation:

The answer is E

Write an equation for perimeter, using the given side lengths: m + m + m + 9 + m + 9 = 4m + 18.

Plug in a value for m such as 2. The perimeter is 2 + 2 + 11 + 11 = 26. Only choice (D) yields this answer when you plug in 2 for m.

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