In the school, there are 34 people participating in the art interest group. The number of people participating in the sports interest group is twice that of the art interest group. The number of music interest groups is 12 less than twice the number of people participating in the sports interest group. How many people are there?
学校里参加美术兴趣小组的有34人，参加体育兴趣小组的人数是参加美术兴趣小组人数的2倍，参加音乐兴趣小组的人数比参加体育兴趣小组人数的2倍少12人，参加音乐兴趣小组的人数是多少？
<gadget id="calculator">34 * 2</gadget>
<output>68</output>

<gadget id="calculator">68 * 2</gadget>
<output>136</output>

<gadget id="calculator">136 - 12</gadget>
<output>124</output>

<result>124</result>