The number of girls is more than the number of boys (2/5), then the number of boys is less than the number of girls
女生人数比男生人数多(2/5)，则男生人数比女生人数少多少
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) - 1</gadget>
<output>-3/5 = around -0.6</output>

<gadget id="calculator">1 + (-3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(2/5) / (7/5)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>