The ratio of the numbers A and B is 3:4, how much less is the number A than the number B
甲、乙两数的比是3：4，甲数比乙数少多少
<gadget id="calculator">4 - 3</gadget>
<output>1</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>