Answer: Number of pizzas would be less than 5 but not more than 50.
Explanation:
Since we have given that
Number of pizzas so far = 25
His principal asked him to make at least 30 pizzas but no more than 75.
According to question, we have
30 ≤ x + 25 ≤ 75
First we subtract 25 from both the sides:

Hence, number of pizzas would be less than 5 but not more than 50.