To find the unit rate of books per box, you divide the total number of books by the number of boxes:
\[ \text{Unit rate} = \frac{\text{Total books}}{\text{Total boxes}} = \frac{462 \text{ books}}{7 \text{ boxes}} \]
Now, perform the division:
\[ \frac{462}{7} = 66 \]
So, the unit rate is:
\[ 66 \text{ books per box} \]
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