Girls belong to boys (1/3), how much more boys than girls.
女生是男生的(1/3)，男生比女生多多少．
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/3)</gadget>
<output>2/3 = around 0.666667</output>

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

<result>2</result>