GMAT Quantitative Reasoning Practice Test 2

Question : 92 of 100

Marks: +1, -0

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?

Validate

Solution:

The area of a rectangle is (length)

\times

(width), let

X

be the width of the roof

4 X^2=784

X^2=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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