A minimal fraction can be reduced to (1/25) if its numerator is reduced to the original (1/5) and the denominator is doubled to the original. What is the simplest fraction?
一个最简分数，把它的分子缩小到原来的(1/5)，分母扩大到原来的2倍，可以约简成(1/25)，这个最简分数是多少．
<gadget id="calculator">5 / 12.5</gadget>
<output>0.4</output>

<result>0.4</result>