6 A car has a 16 gallon fuel tank When driven on a highway it has a gas mileage of 30 miles per gallon The gas mileage also called fuel efficiency tells us the number of miles the car can travel for a particular amount of fuel one gallon of gasoline in this case After filling the gas tank the driver got on a highway and drove for a while a How many miles has the car traveled if it has the following amounts of gas left in the tank i 15 gallons ii 10 gallons iii 2 5 gallons b Write an equation that represents the relationship between the distance the car has traveled in miles d and the amount of gas left in the tank in gallons c How many gallons are left in the tank when the car has traveled the following distances on the highway i 90 miles ii 246 miles d Write an equation that makes it easier to find the amount of gas left in the tank I if we know the car has traveled d miles