The ratio of boys to girls in Class 61 is 4:5, how many more girls than boys?
六一班男生与女生的比是4：5，女生比男生人数多多少．
<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>