Question

A security fence encloses a rectangular are on one side of a park in a city. Three sides of fencing are used, since the fourth side of the area is formed by a building. The enclosed area measures 450 square feet. Exactly 60 feet of fencing is used to fence in three sides of this rectangle. What are the possible dimensions that could have been used to construct this area?
well, 450 = 30*15, and 15+30+15=60

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