The ratio of the numbers A and B is 7:5, how much is A more than B?
甲乙两数的比是7：5，甲数比乙数多百分之几？
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>