Teacher Wang has to correct 84 compositions. Corrected 14 articles on the first day, and corrected 16 articles on the second day. The rest will be corrected in 3 days. How many articles are corrected per day on average?
王老师要批改84篇作文．第一天批改了14篇，第二天批改了16篇．余下的要3天批改完，平均每天批改多少篇？
<gadget id="calculator">14 + 16</gadget>
<output>30</output>

<gadget id="calculator">84 - 30</gadget>
<output>54</output>

<gadget id="calculator">54 / 3</gadget>
<output>18</output>

<result>18</result>