To typeset a manuscript, if you type 640 characters per page, you need 200 pages; if you type 800 characters per page, how many pages can you type?
排版一部书稿，如果每页排640个字，要200页；如果每页排800个字，可排多少页？
<gadget id="calculator">640 * 200</gadget>
<output>128_000</output>

<gadget id="calculator">128_000 / 800</gadget>
<output>160</output>

<result>160</result>