Final answer:
Sarah made 3 1/2 cups of treats in total.
Step-by-step explanation:
To find the total cups of treats, we need to add the amounts of slime and pumpkin punch together.
2 3/4 cups + 1 2/4 cups = 3 6/4 cups
Simplifying the fraction, we get 3 1/2 cups.
Therefore, Sarah made 3 1/2 cups of treats in total.