book has 80 pages in total. Naughty has read it for 5 days, and there are 45 pages left. How many pages does Naughty read on average every day?
一本书共80页，淘气已经看了5天，还剩45页．淘气平均每天看多少页？
<gadget id="calculator">80 - 45</gadget>
<output>35</output>

<gadget id="calculator">35 / 5</gadget>
<output>7</output>

<result>7</result>