4 gl 2 qt - 1 gl 3 qt equals?
4 gallons, 2 quarts - 1 gallon, 3 quarts = 2 gallons, 3 quarts.
(Since there's 4 quarts in a gallon, you could say that there were
18 quarts - 7 quarts, which would be 11 quarts. 11 quarts / 4
quarts in a gallon = 2 gallons, 3 quarts.)