If the ratio of the number of boys to the number of girls is 5:4, then the number of girls is less than the number of boys.
男生人数与女生人数的比是5：4，则女生人数比男生少多少．
<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>