There are 50 students in Xiao Ming's class, 60% of whom are girls. How many girls are there?
小明所在的班共有学生50人，其中女生占60%，女生有多少人？
<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">50 * (3/5)</gadget>
<output>30</output>

<result>30</result>