Water flowed out of a tank at a steady rate. A total of 18 and 1 half gallons flowed out of the tank in 4 and 1 fourth hours. Which expression determines the quantity of water leaving the tank per hour?

To find the amount of water leaving per hour, divide the total gallons by the number of hours. Convert the mixed numbers: 18 1/2 gallons is 37/2 gallons, and 4 1/4 hours is 17/4 hours. The expression (37/2) ÷ (17/4) therefore gives the rate in gallons per hour, which is choice C.

AI-written and checked against the verified answer.