Class 5 (1) has 30 boys and 20 girls. What percentage of the total number of girls are in the class?
五(一)班有男生30人，女生20人，女生占全班总人数的百分之几？
<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<gadget id="calculator">20 / 50</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">100 / 100</gadget>
<output>1</output>

<gadget id="calculator">(2/5) * 1</gadget>
<output>2/5 = around 0.4</output>

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