There is a fraction whose denominator is 12 greater than the numerator. If 3 is added to both the numerator and the denominator, it can be divided into (1/4). What is the fraction?
有一个分数，分母比分子大12，如果分子、分母都加上3可约分为(1/4)，这个分数是多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(1/4) * 12</gadget>
<output>3</output>

<gadget id="calculator">(1/4) * 3</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) - 3</gadget>
<output>-9/4 = around -2.25</output>

<gadget id="calculator">3 + (-9/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / (3/4)</gadget>
<output>1</output>

<gadget id="calculator">1 + 12</gadget>
<output>13</output>

<gadget id="calculator">(3/4) / (3/4) / 13</gadget>
<output>1/13 = around 0.076923</output>

<result>1/13 = around 0.076923</result>