A story book has 180 pages in total, Xiaoxiao has already read 80 pages, and the rest needs to be read within 5 days. How many pages do you read on average every day?
一本故事书共有180页，笑笑已经看了80页，剩下的要在5天内看完，平均每天要看多少页．
<gadget id="calculator">180 - 80</gadget>
<output>100</output>

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

<result>20</result>