For a simple fraction, if its numerator is doubled and its denominator is reduced to (1/3), then it is equal to (2/3). What is the original fraction?
一个最简分数，把它的分子扩大到原来的2倍，分母缩小到原来的(1/3)后等于(2/3)，原来的分数是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">(1/2) / 9</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">2 * (1/18)</gadget>
<output>1/9 = around 0.111111</output>

<result>1/9 = around 0.111111</result>