Question

Trevor began his pizza delivery route with 7/10 of a tank of gas in his car. When he made it back to the pizzeria, 2/5 of a tank of gas was left. How much gas did Trevor use?

Answer 1

You need to find a common denominator. The common denominator is 10. So 2/5*2=4/10

7/10-4/10=3/10

Trevor used 3/10 of a tank of gas.