To find the unit rate, you divide the total number of books by the total number of boxes.
Given:
- Total books = 42
- Total boxes = 6
Unit rate = Total books / Total boxes
\[ \text{Unit rate} = \frac{42 \text{ books}}{6 \text{ boxes}} = 7 \text{ books per box} \]
Thus, the unit rate is 7 books per box.
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