There are two interest groups in the school. There are 27 people in the painting group in Class 3 and Class 2, 24 people in the Chess Group, and 8 people in both groups.
学校开设两个兴趣小组，三2班有27人参加绘画小组，有24人参加棋艺小组，8人两个小组都参加，三2班参加这两个兴趣小组的共有多少人．
<gadget id="calculator">24 - 8</gadget>
<output>16</output>

<gadget id="calculator">27 + 16</gadget>
<output>43</output>

<result>43</result>