Xiao Ming reads a 55-page story book, and has already read 25 pages. In the next few days, he plans to read 15 pages a day. How many days will Xiao Ming have to read to finish the book?
小明看一本55页的故事书，已经看了25页，接下来的几天打算每天看15页，小明还要看几天才能看完这本书？
<gadget id="calculator">55 - 25</gadget>
<output>30</output>

<gadget id="calculator">30 / 15</gadget>
<output>2</output>

<result>2</result>