Xiao Ming reads a book, reads 24 pages every day, and finishes it in 20 days. If you read 8 pages less every day, how many days can you finish it? (column ratio solution)
小明看一本书，每天看24页，20天正好看完．如果每天少看8页，多少天可以看完？(列比例解答)
<gadget id="calculator">24 * 20</gadget>
<output>480</output>

<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<gadget id="calculator">480 / 16</gadget>
<output>30</output>

<result>30</result>