There are 20 male students in a class and 25 female students, what is the percentage of male students in the class?
某班男同学有20人，女同学有25人，该班男同学人数占全班人数的多少．
<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>