The ratio of the numbers A and B is 4:5, how much more the number B is than the number A.
甲、乙两数的比是4：5，乙数比甲数多多少．
<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>