The number of boys in a class is 1/3 of the number of girls, and the number of boys is the number of the whole class. (fill in percentage)
某班男生人数是女生人数的(1/3)，男生人数是全班人数的多少．(填百分数)
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">1 + 3</gadget>
<output>4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>