To find the unit rate of 21 chapters in 7 days, divide the number of chapters by the number of days:
\[ \text{Unit rate} = \frac{21 \text{ chapters}}{7 \text{ days}} = 3 \text{ chapters per day} \]
So, the unit rate is 3 chapters per day.
what is the unit rate of 21 chapters in 7days
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