The owners of a rectangular swimming pool want to surround the pool with a crushed-stone border of uniform width. They have enough stone to cover 74 square meters. How wide should they make the border if the pool measures 10 meters by 25 meters?
Do I take the area of the larger rectangle minus the area of the smaller rectangle to get the area of the border. Like this:
(10 meter x 25 meter)-(74 square meters)=176 square meters
Not sure what to do please help.