There are 20 girls and 25 boys in Class 1 of the fifth grade, and the number of girls accounts for ((())/(())) of the whole class.
五年级一班有女生20人，男生25人，女生人数占全班人数的((())/(()))．
<gadget id="calculator">20 + 25</gadget>
<output>45</output>

<gadget id="calculator">20 / 45</gadget>
<output>4/9 = around 0.444444</output>

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