The denominator of a fraction is 12 more than the numerator, and after the division is (2/5), what is the original fraction.
一个分数的分母比分子多12，约分之后是(2/5)，这个分数原来是多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

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