The number of boys is 3/5 of the number of girls, and how many boys account for the whole class.
男生人数是女生人数的(3/5)，男生占全班人数的多少．
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 + (3/5)</gadget>
<output>8/5 = around 1.6</output>

<gadget id="calculator">(3/5) / (8/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>