Jeff Miller

GMAT OFFICIAL GUIDE PS – The smaller rectangle in the figure above…

The smaller rectangle in the figure above…

Solution:

We are given a diagram, which represents a parking lot, with a smaller rectangle inside a larger rectangle. The dimensions of the smaller rectangle are 100 ft by 150 ft, and the dimensions of the larger rectangle are (100 + w) ft by (150 + w) ft. Since the area of the larger rectangle is twice that of the smaller rectangle, we can create the following equation:

(w + 100)(w + 150) = 2(100 x 150)

w^2 + 250w + 15,000 = 30,000

w^2 + 250w – 15,000 = 0

(w + 300)(w – 50) = 0

w = -300 or w = 50

Since w must be positive, w must be 50.

Answer: B

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