A minimal fraction can be reduced to (1/25) if its numerator is reduced by 5 times and its denominator is doubled. What is the original fraction?
一个最简分数，把它的分子缩小5倍，分母扩大2倍可以化简成(1/25)，原来这个最简分数是多少．
<gadget id="calculator">25 / 1</gadget>
<output>25</output>

<gadget id="calculator">10 / 25</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>