Question

Mike bought 3 gallons of orange juice to make fruit punch for a party. He used 9 quarts of the orange juice. How many quarts of orange juice were left? (1 gallon = 4 quarts)

Answer 1

he has around 1 gallon left or less

Answer 2

3 gallons x 4 qt/gallon = 12 quarts total.
He used 9, so he has 12 qt. - 9 qt. remaining.
3 Quarts remain.