Answer: Luna Lovegood made 24 cups of smoothie.
Step-by-step explanation: We have to convert the measurements to cups.
Orange Juice:
2 1/2 quarts converted to cups is 10 cups.
2 1/2 or 2.5 multiplied by 4 equals to 10
Milk:
4 1/2 or 4.5 pints converted to cups is 9 cups.
You have to do 4.5 times 2 to get 9.
Pineapple Juice:
5 cups. Since it's already been converted we don't do anything to convert.
Lastly, we add.
10+9+5=24 cups.