Teacher Liu corrected 98 essays, and corrected 20 essays on the second day, 8 more than the first day, how many essays are left unmarked?
刘老师批改98篇作文，第二天批改了20篇，比第一天多批改了8篇，还有多少篇没有批改？
<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">98 - 12 - 20</gadget>
<output>66</output>

<result>66</result>