The ratio of the numbers A and B is 3:5, how much less is the number A than the number B.
甲、乙两数的比是3：5，甲数比乙数少多少．
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

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

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