The ratio of the number of boys to girls is 4:5, the number of boys is much smaller than the number of girls.
男、女生人数的比是4：5，男生人数比女生人数少多少．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>