A popular science book originally had 576 characters per page and 125 pages. When it was republished, the font size was changed to 720 characters per page. How many pages are there now? (Solution by proportional method)
一本科普书原来每页排576个字，排了125页，再版时，字号改小了，每页排了720个字，这时排了多少页？(用比例方法解)
<gadget id="calculator">576 * 125</gadget>
<output>72_000</output>

<gadget id="calculator">72_000 / 720</gadget>
<output>100</output>

<result>100</result>