Noah bought a new car it gets 21.7 miles per gallon of gas his tank is able to hold 14 gallons of gas. how many miles can noah travel on one tank of gas

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)