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The text in the image describes a problem where **Mr. Wang** has some exercise books, with their number ranging from 20 to 30. These books are distributed evenly among 3 students, and each student receives 1 book. Additionally, after distributing 1 book to each student, Mr. Wang redistributes the remaining books evenly among 4 students, including the previous 3.

The question is asking how many exercise books Mr. Wang has in total.

### Explanation:
1. Mr. Wang distributes **1 book each** to 3 students. So, he distributes 3 books in this step.
2. After that, the remaining books are evenly distributed among 4 students (including the 3 from the first step).

Let the total number of books be \( x \), where \( 20 \leq x \leq 30 \). 
- After giving 1 book to each of the 3 students, the remaining books are \( x - 3 \).
- The remaining books \( x - 3 \) must be divisible by 4, as the remaining books are distributed evenly among 4 students.

### Solution:
We will now find values of \( x \) that satisfy both conditions: \( 20 \leq x \leq 30 \) and \( (x - 3) \) must be divisible by 4.

Let me calculate the possible solutions.The possible values for the total number of exercise books Mr. Wang has are **23** and **27**. Both of these satisfy the condition that after distributing 1 book each to 3 students, the remaining books are divisible by 4.

Would you like further details or have any questions?

Here are 5 related questions you might find helpful:
1. What happens if the number of books is not divisible evenly?
2. Can we generalize this problem to more students?
3. How can we apply modular arithmetic to solve similar problems?
4. What if the number of students changes? How would that affect the solution?
5. Can this method be used to distribute other items besides books?

**Tip:** In problems involving distribution and divisibility, modular arithmetic is a useful tool to check for evenly distributed quantities.

Mr. Wang has some exercise books, with their number ranging from 20 to 30. He distributes 1 book to each of 3 students. After that, the remaining books are evenly distributed among 4 students. How many exercise books does Mr. Wang have?

Solve the problem of how many exercise books Mr. Wang has, using concepts like divisibility and modular arithmetic. This math problem involves distributing books among students, and is suitable for Grades 5-7.

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