Harold Goldstein and his wife Elaine recently installed a built-in rectangular swimming pool measuring 20 feet by 40 feet. How wide can they make a tile border of uniform width if they purchased enough tile to cover 396 square feet?

Question

They want to add the border around all sides of the pool.

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Answer 1 · 2016-06-04T07:33:51

#3.30# feet width of tiles.

The perimeter of swimming pool is #2xx(20+40)=2xx60=120# feet.

Hence to cover #396# square feet, they will need

#396/120=(12xx33)/(12xx10)=33/10=3.30# feet width of tiles.