There are 15 boys in the chorus team and 21 girls. They should be divided into 3 groups on average. How many people are there in each group?
合唱队男生有15人，女生有21人，要平均分成3组，每组有多少人．
<gadget id="calculator">15 + 21</gadget>
<output>36</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>