#1- 1/2 +1/4 of a gallon = 3/4 of a gallon. 3/4 in a decimal form is .75. .75 gallons is equal to 3 quarts. 3 and 3/4 quarts of paint is left.
#2 you have to make the quarts to pints. 1 quarts is equal to 2 pints. 3quarts = 6 pints and .75 quarts= 1.5 pints. so 7.5 pints is the answer