The school has three extracurricular interest groups of art, dance and chorus, with an average of 40 people in each group. The ratio of the number of people in the three groups is 2:3:5. How many people are there in the chorus interest group?
学校有美术、舞蹈和合唱三个课外兴趣小组，平均每个小组有40人，三个小组的人数比为2：3：5，合唱兴趣小组有多少人？
<gadget id="calculator">40 * 3</gadget>
<output>120</output>

<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">5 / 10</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">120 * (1/2)</gadget>
<output>60</output>

<result>60</result>