The ratio of number A to number B is 5:7, how much more number B is than number A.
甲数与乙数的比是5：7，乙数比甲数多多少．
<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>