The area of a rectangle is 630 square inches. The length of the rectangle is 70 inches. What is the

Question

The area of a rectangle is 630 square inches. The length of the rectangle is 70 inches. What is the width, in inches, of this rectangle?

Accepted Answer

Choice A is correct. The area A , in square inches, of a rectangle is the product of its length l , in inches, and its width w , in inches; thus, A = l w . It's given that the area of a rectangle is 630 square inches and the length of the rectangle is 70 inches. Substituting 630 for A and 70 for l in the equation A = l w yields 630 = 70 w . Dividing both sides of this equation by 70 yields 9 = w . Therefore, the width, in inches, of this rectangle is 9 . Choice B is incorrect. This is the length, not the width, in inches, of the rectangle. Choice C is incorrect. This is half the area, in square inches, not the width, in inches, of the rectangle. Choice D is incorrect. This is the difference between the area, in square inches, and the length, in inches, of the rectangle, not the width, in inches, of the rectangle.

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