Final answer:
To make a total of 42 cups of fruit punch, you can use various combinations of pineapple juice and apple juice, such as 20 cups of pineapple juice and 22 cups of apple juice.
Step-by-step explanation:
To make a total of 42 cups of fruit punch, you need to determine the amount of pineapple juice and apple juice required. Let's assume you need x cups of pineapple juice and y cups of apple juice.
The sum of the pineapple juice and apple juice should be equal to 42 cups, so we can write the equation x + y = 42.
Since you have not provided any additional information or restrictions, there are several valid combinations of pineapple juice and apple juice that can total 42 cups, such as x=20 cups of pineapple juice and y=22 cups of apple juice, or x=15 cups of pineapple juice and y=27 cups of apple juice.