For a simple fraction, the sum of the numerator and the denominator is 60. If 7 is added to both the numerator and the denominator, the resulting fraction is (9/28), what is the original fraction?
一个最简分数，分子和分母之和是60，若分子和分母都加上7，得到的分数约分后是(9/28)，原来的分数是多少．
<gadget id="calculator">60 + 7 + 7</gadget>
<output>74</output>

<gadget id="calculator">9 + 28</gadget>
<output>37</output>

<gadget id="calculator">9 / 37</gadget>
<output>9/37 = around 0.243243</output>

<gadget id="calculator">74 * (9/37)</gadget>
<output>18</output>

<gadget id="calculator">18 - 7</gadget>
<output>11</output>

<gadget id="calculator">28 / 37</gadget>
<output>28/37 = around 0.756757</output>

<gadget id="calculator">74 * (28/37)</gadget>
<output>56</output>

<gadget id="calculator">56 - 7</gadget>
<output>49</output>

<gadget id="calculator">11 / 49</gadget>
<output>11/49 = around 0.22449</output>

<result>11/49 = around 0.22449</result>