The Children's Palace Drum Band has 15 male and 15 female students each, and the chorus has three times the number of drum bands. How many people are there in the chorus?
少年宫鼓乐队有男、女同学各15人，合唱队的人数是鼓乐队的3倍．合唱队有多少人．
<gadget id="calculator">15 + 15</gadget>
<output>30</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>