The third grade carries out squadron activities. The 138 students were divided into 3 squadrons on average, and each squadron was divided into 2 groups on average. How many people are in each group?
三年级开展中队活动．把138名同学平均分成3个中队，每个中队平均分成2组．每组多少人？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">138 / 6</gadget>
<output>23</output>

<result>23</result>