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Let's break down the problem:

- **Adults' section fine**: 20¢ per day for each overdue book.
- **Children's section fine**: 5¢ per day for each overdue book.
- **Overdue books**: 
  - 4 books from the adults' section.
  - 2 books from the children's section.
- **Overdue time**: 3 days late.

### Fine for Adults' Section Books:
- 4 books × 20¢ per day = 80¢ per day.
- For 3 days, the total fine for adults' section books: $ 80¢ \times 3 = 240¢ = \$2.40 $.

### Fine for Children's Section Books:
- 2 books × 5¢ per day = 10¢ per day.
- For 3 days, the total fine for children's section books: $ 10¢ \times 3 = 30¢ = \$0.30 $.

### Total Fine:
- \$2.40 (adults' section) + \$0.30 (children's section) = **\$2.70**.

The correct answer is **E. $2.70**.

Do you need any further clarification or details on this? 

Here are 5 related questions you might find useful:
1. How would the total change if only 2 books from the adults' section were overdue?
2. What if the overdue period was 5 days instead of 3 days?
3. What if all 6 books were from the children's section?
4. How would the fine be affected if the rate for adults' books increased to 30¢ per day?
5. How much would the fine be if the library had no charges for the first day overdue?

**Tip**: Always carefully multiply the overdue days by both the number of books and the daily fine rate to avoid calculation errors.

A library imposes a fine of 20¢ per day for each overdue book from the adults' section of the library and 5¢ per day for each overdue book from the children's section. If 4 books from the adults' section and 2 books from the children's section are returned 3 days late, how much is owed to the library?

Solve a problem where you calculate the total fine for 4 books from the adults' section and 2 books from the children's section that are returned 3 days late. The fine is 20¢ per day for adults' books and 5¢ per day for children's books. Suitable for students in Grades 5-7.

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