There are 1,200 books in the library, and 40% of them are loaned out. How many books are left?
图书室有图书1200本，借出40%，还剩多少本？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1_200 * (3/5)</gadget>
<output>720</output>

<result>720</result>