The ratio of the numbers A and B is 4:5, how much smaller is the number A than the number B
甲、乙两数的比是4：5，甲数比乙数小多少
<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>