There are 45 students in class 1 of six years, including 20 girls. How many percent of the class are girls?
六年一班有学生45人，其中女生有20人．女生人数占全班的几分之几？
<gadget id="calculator">20 / 45</gadget>
<output>4/9 = around 0.444444</output>

<result>4/9 = around 0.444444</result>