The number of girls accounts for the whole class (2/5), and the number of boys accounts for the number of the whole class.
女生人数占全班人数的(2/5)，男生人数占全班人数的多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>