Question

Number of books checked out this year
Teens. Adults
Fiction. 450. 875
Self help. 325. 560
Historical. 255. 745
Biographies. 180. 620
Number of books out last year
Teens. Adults
Fiction. 420. 880
Self help. 315. 545
Historical. 275. 740
Biographies. 175. 635
The librarian at a local library is keeping track of how many of each type of book is checked out by teens and adults find the difference between the data for this year and last year

Answer 1

To find the difference in the number of books checked out this year compared to last year, we can subtract the number of books checked out last year from the number of books checked out this year for each category.

### Difference in Checked Out Books

**Teens:**

- **Fiction:**
- This Year: 450
- Last Year: 420
- Difference: \(450 - 420 = 30\)

- **Self Help:**
- This Year: 325
- Last Year: 315
- Difference: \(325 - 315 = 10\)

- **Historical:**
- This Year: 255
- Last Year: 275
- Difference: \(255 - 275 = -20\)

- **Biographies:**
- This Year: 180
- Last Year: 175
- Difference: \(180 - 175 = 5\)

**Adults:**

- **Fiction:**
- This Year: 875
- Last Year: 880
- Difference: \(875 - 880 = -5\)

- **Self Help:**
- This Year: 560
- Last Year: 545
- Difference: \(560 - 545 = 15\)

- **Historical:**
- This Year: 745
- Last Year: 740
- Difference: \(745 - 740 = 5\)

- **Biographies:**
- This Year: 620
- Last Year: 635
- Difference: \(620 - 635 = -15\)

### Summary of Differences

| Category | Teens Difference | Adults Difference |
|----------------|------------------|-------------------|
| Fiction | +30 | -5 |
| Self Help | +10 | +15 |
| Historical | -20 | +5 |
| Biographies | +5 | -15 |

This table summarizes the differences in the number of books checked out between this year and last year for both teens and adults in various categories.