There are 120 books in the Book Corner of Class 1. After lending 80 books, what percentage of them are left unchecked?
六一班图书角有图书120本，借出80本后，还剩下几分之几没有借出？
<gadget id="calculator">120 - 80</gadget>
<output>40</output>

<gadget id="calculator">40 / 120</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>