The ratio of number A to number B is 9:5, how much more number A is than number B.
甲数与乙数的比是9：5，甲数比乙数多多少．
<gadget id="calculator">9 - 5</gadget>
<output>4</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>