Use a batch of paper to bind the same workbook, each with 32 pages, and you can bind 400 copies; if each book has 40 pages, how many books can you bind? (Solve with ratio)
用一批纸装订同样的作业本，每本32页，可以装订400本；如果每本40页，可以装订多少本？(用比例解)
<gadget id="calculator">32 * 400</gadget>
<output>12_800</output>

<gadget id="calculator">12_800 / 40</gadget>
<output>320</output>

<result>320</result>