The ratio of A and B is 4:5, what percentage is B greater than A?
甲、乙两数的比是4：5，求乙比甲多几分之几？
<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>