The ratio of the numbers A and B is 3:4, and the number of A is less than the number of B (1/2), what is the number of B?
甲、乙两数的比是3：4，且甲数比乙数少(1/2)，则乙数为多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<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">(1/2) / (1/4)</gadget>
<output>2</output>

<result>2</result>