There are 120 people in the three classes of the third grade participating in the art group. If each class has two art groups, how many people are there on average in each art group?
三年级3个班有120人参加了文艺小组，如果每个班有2个文艺小组，平均每个文艺小组有多少人？
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<result>20</result>