The number of boys is (1/2) the number of girls, and the number of girls is greater than the number of boys.
男生人数是女生人数的(1/2)，女生人数比男生人数多多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

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

<result>1</result>