My gas tank holds 18 gallons of gas, it is 3/8 full. Gas per gallon costs $2.80. How much money will it take to fill my gas tank?

Answer 1

If the tank is 3/8 full, it will take 5/8 of a tank to fill it.

Amount of gas to buy = (5/8) * 18 = 45/4 gal

Cost of gas = 45 * 2.80/4 = $31.50