Actually Welcome to the Concept of the ratio and proportion.
here, we clearly notice, that,
4 cups have 2 ounces each, that is
=> 4×2 = 8 ounces
also, 1 cup with 3 ounces,
=> 1×3 = 3 ounces,
adding both we get as,
8+3 = 11 ounces,
the total is 11 ounces.