A batch of paper, stapled into 20-page exercise books, can order 600 copies. How many copies can be ordered if it is stapled into a 24-page exercise book?
一批纸张，钉成20页一本的练习本，能订600本．如果钉成24页一本的练习本，能订多少本？
<gadget id="calculator">20 * 600</gadget>
<output>12_000</output>

<gadget id="calculator">12_000 / 24</gadget>
<output>500</output>

<result>500</result>