Teacher Li corrects the math test papers. There are 48 test papers in the class and 12 of them have been corrected. The rest needs to be completed within 2 hours.
李老师批改数学试卷，班上有48份试卷已经批改好12份，剩下要在2小时内完成，平均每小时要批改多少份？
<gadget id="calculator">48 - 12</gadget>
<output>36</output>

<gadget id="calculator">36 / 2</gadget>
<output>18</output>

<result>18</result>