There are 28 people in the school calligraphy interest group, which is 14 people less than twice that of the art interest group. How many people are there in the art interest group?
学校书法兴趣小组有28人，比美术兴趣小组的2倍少14人，美术兴趣小组有多少人？
<gadget id="calculator">28 + 14</gadget>
<output>42</output>

<gadget id="calculator">42 / 2</gadget>
<output>21</output>

<result>21</result>