There are 45 students in the sixth grade in a certain school, including 25 boys and 20 girls. What fraction of the number of girls is the number of boys?
某校六年级有学生45人，其中有男生25人，女生20人，女生人数是男生人数的几分之几？
<gadget id="calculator">20 / 25</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>