If the full tank of gas in her car holds 14 1/3 gallons, you need to divide 14 1/3 by 3 to figure out how much gas Mrs. Tran has. 14 1/3 divided by 3 equals 4 7/9.
So, Mrs. Tran has about 4 7/9 gallons of gas in her car, or about 4.77778 gallons of gas.