Question

A hose is filling a water tank at the rate of 70 gallons per minute. A loose drain plug causes 4 gallons per minute to drain out. How many minutes does it take to fill a tank with a capacity of 3960 gallons?​

Answer 1

60 minutes

Explanation:

You would do a proportion of 70 gallons over 1 min, which is equal to 66 gallons over 1 min. Then you would set up a second proportion of 66 gal over 1 min equals 3960 gal over x. Once you cross-multiply, you would get 60 minutes.