If you would like to know how many miles can you drive with 13.2 gallons of gasoline, you can calculate this using the following steps:
21.7 miles ... 1 gallon of gasoline
x miles = ? ... 13.2 gallons of gasoline
21.7 * 13.2 = 1 * x
x = 21.7 * 13.2
x = 286.44 miles
The correct result would be 286.44 miles.
