The ratio of the number of people who wear glasses to those who don't wear glasses in Class 51 of a school is 3:7, the ratio of male students is 1:2, and the ratio of female students is 1:3, how many female students account for the whole class How much?
某校五一班戴眼镜和不戴眼镜的人数比是3：7，男同学中二者比是1：2，女同学中二者比是1：3，女同学人数占全班人数的几分之几？
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>