Answer:
28 cups
Step-by-step explanation:
There are 4 cups in each quart. This means the chocolate ice cream which used 6 quarts is the same as 6*4 = 24 cups.
There are 2 cups in a pint. This means the peach ice cream which used 4 pints is the same as 2*2 = 4 cups.
Together he used 24 + 4 = 28 cups