SSAT Math Question 191: Answer and Explanation
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Question: 191
10. If the length and width of a rectangle are each doubled, by what percent is the area increased?
- A. 50%
- B. 75%
- C. 100%
- D. 300%
Correct Answer: D
Explanation:
The correct answer is (D). Think of a rectangle with the dimensions 
by 
Its area is 2 square inches. If we double each dimension, to 
by 
the area becomes 8 square inches, which is four times the area of the first rectangle. This is equal to an increase of 300%.