The numerator of a fraction is doubled and the denominator is reduced to (1/2) to get (1/4). What is the original fraction?
一个分数的分子扩大到原来的2倍，分母缩小到原来的(1/2)后得到(1/4)，原分数是多少．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">(1/2) / 8</gadget>
<output>1/16 = around 0.0625</output>

<result>1/16 = around 0.0625</result>