Use a batch of paper to bind exercise books of the same size. If each book has 20 sheets, 200 books can be bound. If each book has 25 sheets, how many books can be bound? (Solution with proportional knowledge)
用一批纸装订同样大小的练习本，如果每本20张，可以装订200本，如果每本25张，可以装订多少本？(用比例知识解)
<gadget id="calculator">20 * 200</gadget>
<output>4_000</output>

<gadget id="calculator">4_000 / 25</gadget>
<output>160</output>

<result>160</result>