The numerator of the fraction is expanded to 4 times the original, and the denominator is reduced to the original (1/4), what is the fraction.
分数的分子扩大到原来的4倍，分母缩小到原来的(1/4)，这个分数多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 / (1/4)</gadget>
<output>16</output>

<result>16</result>