There are 40 students in a class, the ratio of male to female students is 5:3, how many girls are there?
某班共有学生40人，男女生人数的比是5：3，女生有多少人．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">40 * (3/8)</gadget>
<output>15</output>

<result>15</result>