Answer:
12 servings.
Explanation:
We have been Joanna mixed 1/4 gallon of orange juice and 1/2 gallon of pineapple juice to make punch.
First of all, we will find amount of punch by adding amount of orange juice and pineapple juice as:

Make a common denominator:




Now, we will divide total amount of punch by amount of each serving to find number of servings.

Convert to multiplication problem by flipping the 2nd fraction:



Therefore, Jonna can make 12 servings of punch shake.