The art group of the school has 18 students, the number of calligraphy group is 6 more than the art group, and the number of chorus group is twice the total number of art group and calligraphy group. How many people are there in the chorus?
学校美术组有18人，书法组的人数比美术组多6人，合唱组的人数是美术组、书法组总人数的2倍．合唱组有多少人？
<gadget id="calculator">18 + 6 + 18</gadget>
<output>42</output>

<gadget id="calculator">42 * 2</gadget>
<output>84</output>

<result>84</result>