**Introduction:**
In this problem, we are given three classmates named Anitha, Sahana, and Myna. We need to determine the number of books they have read based on the given information. Let's analyze the problem step by step.

**Given Information:**
1. Anitha, Sahana, and Myna are classmates.
2. Together, they have 80 books.
3. Myna has 5 more books than Sahana.
4. Anitha has 10 more books than Myna.

**Let's assume:**
Let's assume that Sahana has x number of books. Based on the given information, we can determine the number of books for the other two classmates.

**Determine the number of books for Myna:**
1. Myna has 5 more books than Sahana, so Myna has x + 5 books.

**Determine the number of books for Anitha:**
1. Anitha has 10 more books than Myna, so Anitha has (x + 5) + 10 books, which simplifies to x + 15 books.

**Total number of books:**
Now, we can find the total number of books by adding the number of books for all three classmates.
1. Sahana has x books.
2. Myna has x + 5 books.
3. Anitha has x + 15 books.
4. The sum of these three quantities should be equal to 80 (as given).
x + (x + 5) + (x + 15) = 80
3x + 20 = 80
3x = 60
x = 20

**Determine the number of books for each classmate:**
1. Sahana has x books, which is 20.
2. Myna has x + 5 books, which is 20 + 5 = 25.
3. Anitha has x + 15 books, which is 20 + 15 = 35.

Therefore, Sahana has read 20 books, Myna has read 25 books, and Anitha has read 35 books.

**Conclusion:**
Based on the given information and the assumptions made, Sahana has read 20 books, Myna has read 25 books, and Anitha has read 35 books.

No I don't now the answer