4. (5 points) In the third grade, there are two classes, Class A and Class B. If 4 students are transferred from Class A to Class B, the number of students in both classes will be equal. Class A has $\qquad$ more students than Class B.
【Answer】Solution: $4 \times 2=8$ (people) Answer: Class A has 8 more people than Class B. Therefore, the answer is: 8.