A pool is surrounded by a deck that has the same width all the way around. The total area of the deck only is 400 square feet. The dimensions of the pool are 18 feet by 24 feet. How many feet is the width of the deck?

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A pool is surrounded by a deck that has the same width all the way around. The total area of the deck only is 400 square feet. The dimensions of the pool are 18 feet by 24 feet. How many feet is the width of the deck?