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.