There are 15 boys in the art group, and the number of girls is three times that of boys. How many people are there in the art group?
美术组有15名男生，女生人数是男生的3倍，美术组一共有多少人．
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>