The ratio of male students to female students is 5:4, which means how much fewer female students than male students
男同学和女同学的人数比是5：4，表示女同学比男同学少多少
<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>