Paolo is putting a fence around his pool. The length of the pool is 20 feet, the width is (20-x) feet, and the area of the pool is 300 square feet. Recall that area is length multiplied by width. The equation below models the area of the pool.
20 (20-x) = 300
What is the value of x? Round to the units place.
5
8
15
35
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