If the latter term of a ratio is 6 and the ratio is (1/2), what is the former term?
一个比的后项是6，比值是(1/2)，那么前项是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * 6</gadget>
<output>3</output>

<result>3</result>