Use a stack of paper to bind exercise books of the same size. If each book has 16 pages, then 10 books can be bound; if each book has 20 pages, how many books can be bound less?
用一叠纸装订同样大小的练习本，如果每本16页，那么可装订10本；如果每本20页，那么可以少装订多少本？
<gadget id="calculator">16 * 10</gadget>
<output>160</output>

<gadget id="calculator">160 / 20</gadget>
<output>8</output>

<result>8</result>