The ratio of the numbers A and B is 3:4, the number A is 0.5 less than the number B, what is the number B?
甲、乙两数的比是3：4，甲数比乙数少0.5，乙数是多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">0.5 / (1/4)</gadget>
<output>2</output>

<result>2</result>