Teacher Wang wants to wholesale 84 essays, and has already corrected 12 essays. If 9 articles are wholesaled every hour, how many hours will it take to complete the wholesale?
王老师要批发84篇作文，已经批改了12篇．如果每小时批发9篇，还要几小时能批发完？
<gadget id="calculator">84 - 12</gadget>
<output>72</output>

<gadget id="calculator">72 / 9</gadget>
<output>8</output>

<result>8</result>