A swimming pool is filled with water at a rate of 7 1/2 gallons per minute. If the pool can hold 150 gallons, how long will it take to fill the pool from empty?
To fill the pool from empty, we need to divide the pool capacity by the rate at which water is being filled.
The rate at which the pool is being filled is 7 1/2 gallons per minute, which can be written as 7.5 gallons per minute.
Thus, we divide 150 gallons by 7.5 gallons per minute:
150 gallons / 7.5 gallons per minute = 20 minutes
So, it will take 20 minutes to fill the pool from empty.