The ratio of the number of girls to the number of boys in Class 1 is 1:2, and the number of girls accounts for the whole class ((())/(())).
六1班女生人数与男生人数的比是1：2，女生人数占全班的((())/(()))．
<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>