A book has 200 pages, I read 40 pages mischievously, and the rest will take 8 days to finish reading, how many pages do I read on average every day?
一本书有200页，淘气看了40页，剩下的要8天看完，平均每天看多少页？
<gadget id="calculator">200 - 40</gadget>
<output>160</output>

<gadget id="calculator">160 / 8</gadget>
<output>20</output>

<result>20</result>