Answer:the number of miles per gallon that they were able to get is 18
Explanation:
The Paddock family drove 360 miles on a full tank of gasoline.
if their gas tank holds 20 gallons of gas, it means that the number of miles per gallon that they were able to get would be total number of miles driven divided by the car's tank capacity. It becomes
360/20 = 18 miles per gallon