Answer: There are 12 servings which can be made by Jonna.
Explanation:
Since we have given that
Number of gallon of orange juice is mixed to make punch is given by

Number of gallon of pineapple juice is mixed to make punch is given by

Number of gallon in each serving is given by

Now, we need to find the number of servings Jonna can make ,
So, it will be

So, there are 12 servings which can be made by Jonna.