A book has 180 pages, I read 80 pages mischievously, and finished reading the remaining 5 days, how many pages do I read on average every day?
一本书有180页，淘气看了80页，剩下的5天看完，平均每天看几页？
<gadget id="calculator">180 - 80</gadget>
<output>100</output>

<gadget id="calculator">100 / 5</gadget>
<output>20</output>

<result>20</result>