A fraction, if 3 is added to the numerator, it will be (1/3) after reduction, if the denominator is reduced by 2, it will be (1/4) after reduction, what is the original fraction?
一个分数，如果分子加上3，约分后是(1/3)，如果分母减少2，约分后是(1/4)，原分数是多少．
<gadget id="calculator">7 / 30</gadget>
<output>7/30 = around 0.233333</output>

<result>7/30 = around 0.233333</result>