Xiaogang reads a 130-page story book, and he has already read 30 pages. He wants to finish the rest of the book within 5 days. How many pages does he need to read on average every day?
小刚看一本130页的故事书，已经看了30页，剩下的书他想在5天内看完，平均每天要看多少页？
<gadget id="calculator">130 - 30</gadget>
<output>100</output>

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

<result>20</result>