The chorus team of the Children's Palace has 120 members, and the number of girls is three times that of boys. How many boys are there in the chorus?
少年宫合唱队有队员120人，其中女生人数是男生人数的3倍，合唱队有多少名男生？
<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<result>30</result>