Home » GMAT » What is the difference between the length and the width of the roof?
The roof of an apartment building is rectangular and its length is 4 times longer than its width. If the area of the roof is 784 feet squared, what is the difference between the length and the width of the roof?
A. 38.
B. 40.
C. 42.
D. 44.
E. 46.
Correct Answer: B
Explanation/Reference:
Explanation:
The area of a rectangle is (length) x (width), let X be the width of the roof 4X2 = 784 X2 = 196 X = 14.
The width of the roof is 14 and the length is 56. The difference is (56-14 = 42).
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