If you read 20 pages of a book a day, you can finish it in 48 days; if you read 4 more pages a day, how many days can you finish it (using a ratio)?
一本书每天读20页，48天可读完；如果每天多读4页，多少天可读完(用比例解)？
<gadget id="calculator">20 * 48</gadget>
<output>960</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">960 / 24</gadget>
<output>40</output>

<result>40</result>