Answer: 4
or 4.5 pizzas
Explanation:
We can add the leftover pizzas together to find the total pizza leftover.
First, I will add the whole numbers together. This gives us 3. Then, I will add the fractions. This gives us one and a half, or 1.5. Lastly, I will add them together. This gives us 4 and a half, or 4.5.
2 + 1 = 3

3 + 1
= 4