Since a serving is 1/2 cup and he needs 72 servings you can multiply 72 by 1/2 and find out that he needs to make 36 cups of punch. Two cups is a pint so he needs (36 / 2) 18 pints of juice. He already has the 8 pints of pineapple juice so 18 - 8 leaves 10 pints of orange juice.
If I'm not wrong, it should be 27cm^3. Hope this helps!!


distributed
choose 1 as your lowest positive integer
plug 1 into a and b
1 + 1 + 1 + 1