Number of ounces left is 1120
Step-by-step explanation:
Given total soup prepared each day = 15 gallons
Amount served each day = 1/4 of 15 = 15/4 gallons
Amount left after each day = 15 - 15/4 = 60 - 15/4 = 35/4 gallons
35/4 gallons = 35/4 × 128 = 1120 ounces