Binding exercise books for students, the original plan is to bind 20 pages per book, and 30,000 books will be bound. In fact, each book has increased by 4 pages. How many books can actually be bound?
装订学生用的练习本，原计划每本装订20页，装订30000本，实际每本增加了4页，实际可以装订多少本？
<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<gadget id="calculator">30_000 / 24</gadget>
<output>1_250</output>

<gadget id="calculator">20 * 1_250</gadget>
<output>25_000</output>

<result>25_000</result>