For a fraction, the sum of the numerator and the denominator is 47. If the denominator is added with 13, the resulting fraction is (1/3), what is the original fraction?
一个分数，分子与分母的和是47，如果分母加上13所得分数是(1/3)，原来分数是多少．
<gadget id="calculator">47 + 13</gadget>
<output>60</output>

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

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 * (1/4)</gadget>
<output>15</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">60 * (3/4)</gadget>
<output>45</output>

<gadget id="calculator">45 - 13</gadget>
<output>32</output>

<gadget id="calculator">15 / 32</gadget>
<output>15/32 = around 0.46875</output>

<result>15/32 = around 0.46875</result>