Arectangular swimming pool is 25 ft long and 20 1/2 ft wide, and it must be filled to a depth of 4 1/2 ft. one cubic foot of water is equal to 7 1/2 gallons. how many gallons of water will it take to fill the pool?

ANSWER

307½ gallons of water

EXPLANATION

The volume of the rectangular swimming pool is

where l=25ft and w=20½ ft.

when it is filled to a depth of 4½ ft ,then the height is , h=4½ ft.

We substitute these values into the formula to get:

If one cubic foot of water is 7½ gallons, then 2306.25 cubic feet will be

We need 307.5 gallons of water to fill the pool.

the correct answer is 5 6 and 7