To find the unit rate of books per box, you divide the total number of books by the total number of boxes.
Given:
- Total books = 660
- Total boxes = 10
The calculation is:
\[ \text{Books per box} = \frac{\text{Total books}}{\text{Total boxes}} = \frac{660}{10} = 66 \]
So, the unit rate is 66 books per box.
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