Xiaohong has finished reading a 630-page book in 3 weeks. How many pages does she read on average every day?
小红3周读完了一本630页的书，她平均每天读多少页．
<gadget id="calculator">7 * 3</gadget>
<output>21</output>

<gadget id="calculator">630 / 21</gadget>
<output>30</output>

<result>30</result>