The printing factory is binding 920 books, an average of 90 books are bound every day. After working for many days, there are still 110 books left unfinished.
印刷厂在装订920本图书，平均每天装订90本，工作多少天后，还剩下110本没完成．
<gadget id="calculator">920 - 110</gadget>
<output>810</output>

<gadget id="calculator">810 / 90</gadget>
<output>9</output>

<result>9</result>