For the fruit punch, Keira needed 2 gallons of grape juice. She already had 2 quarts of grape juice. Grape juice comes in bottles of 1 pint. How many bottles of grape juice does she need to buy?
Let's equalize the units
1 gallon = 8 pints ....so 2 gallons = 16 pints = what she needs....
1 quart = 2 pints ..... so....2 quarts = 4 pints = what she has
16pints - 4 pints = 12 bottles
+56 
