Aswimming pool and deck are built in a rectangle with length 40ft and width 18ft. if the pool itself is 320 square feet, what is the area of the deck itself?

Calculate total area by multiplying the length by the width:

40 ft x 18 ft = 720 square feet total.

Now subtract the area of the pool:

720 - 320 = 400 square feet for the deck.