The ratio of boys to girls is 5:4, and the number of girls is ((())/(())) of the number of boys.
男生与女生人数的比是5：4，女生人数是男生人数的((())/(()))．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>