There are 48 sixth-grade students participating in the science and technology group, which is 9 more than three times the number of students participating in the art group. How many people participate in the art group?
六年级同学参加科技小组的有48人，比参加文艺小组人数的3倍多9人，参加文艺小组的有多少人？
<gadget id="calculator">48 - 9</gadget>
<output>39</output>

<gadget id="calculator">39 / 3</gadget>
<output>13</output>

<result>13</result>