For a fraction, the numerator is reduced to the original (1/2), the denominator is expanded to 3 times the original, and after simplification is (1/12), what is the original fraction.
一个分数，分子缩小到原来的(1/2)，分母扩大到原来的3倍，化简后是(1/12)，原分数是多少．
<gadget id="calculator">1 / 12</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) / 3</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/12) / (1/6)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>