Teacher Chen has 56 essays to correct, and 20 of them have already been corrected. If 6 articles are corrected every hour, how many hours will it take to complete the correction?
陈老师要批改56篇作文，已经批改了20篇．如果每小时批改6篇，还要几小时才能批改完？
<gadget id="calculator">56 - 20</gadget>
<output>36</output>

<gadget id="calculator">36 / 6</gadget>
<output>6</output>

<result>6</result>