For a fraction, its numerator is doubled and its denominator is doubled to get (3/14). What is the original fraction?
一个分数，它的分子缩小2倍，分母扩大2倍后得(3/14)，原来的分数是多少．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>