The ratio of male students to female students in a school is 4:5, how much more female students than male students?
一所学校男学生与女学生的比是4：5，女学生比男学生人数多多少．
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>