For an article, the editor designed several layout schemes. If you type 200 characters per page, you need to type 30 pages. If you add 50 characters per page, how many pages will you need to type?
一篇文章，编辑设计了几种排版方案．如果每页排200个字，需要排30页，如果每页增加50个字，需排多少页？
<gadget id="calculator">200 * 30</gadget>
<output>6_000</output>

<gadget id="calculator">200 + 50</gadget>
<output>250</output>

<gadget id="calculator">6_000 / 250</gadget>
<output>24</output>

<result>24</result>