Xiaohong reads a story book, if she reads 20 pages a day, she can finish it in 30 days. Now read 25 pages a day, how many days to finish reading? (Solve with ratio)
小红读一本故事书，如果每天读20页，30天读完．现在每天读25页，几天读完？(用比例解)
<gadget id="calculator">20 * 30</gadget>
<output>600</output>

<gadget id="calculator">600 / 25</gadget>
<output>24</output>

<result>24</result>