no one knows until you find out how many apples are in each cup...
It would depend on what size and type of apple your talking about.
160 cups1 gallon = 16 cups1 cup = 0.06 gallon
2.5 qts1 quart = 4 cups 1 cup = 0.25 quart
1 US cup = 8 US fluid ounces10 US cups = 80 US fuild ounces