Use a batch of paper to bind exercise books, each with 30 pages, and 120 copies can be bound. If each book has 25 pages, how many books can be bound?
用一批纸装订练习本，每本30页，可以装订120本．如果每本25页，可以装订多少本？
<gadget id="calculator">30 * 120</gadget>
<output>3_600</output>

<gadget id="calculator">3_600 / 25</gadget>
<output>144</output>

<result>144</result>