There are 18 third-grade students participating in the art interest group, and three times as many students in the chorus group as the art group. How many more people are in the chorus group than the art group?
三年级学生参加美术兴趣小组的有18人，参加合唱组的是美术组的3倍，合唱组比美术组多多少人．
<gadget id="calculator">18 * 3</gadget>
<output>54</output>

<gadget id="calculator">54 - 18</gadget>
<output>36</output>

<result>36</result>