The sum of the numerator and denominator of a fraction is 67. If 5 is added to the numerator and denominator, the ratio of numerator to denominator is 2:9. What is the original fraction?
一个分数的分子与分母的和是67，若把分子与分母各加上5，则分子、分母的比为2：9，原分数是多少．
<gadget id="calculator">67 + 5 + 5</gadget>
<output>77</output>

<gadget id="calculator">2 + 9</gadget>
<output>11</output>

<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">77 * (2/11)</gadget>
<output>14</output>

<gadget id="calculator">14 - 5</gadget>
<output>9</output>

<gadget id="calculator">9 / 11</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">77 * (9/11)</gadget>
<output>63</output>

<gadget id="calculator">63 - 5</gadget>
<output>58</output>

<gadget id="calculator">9 / 58</gadget>
<output>9/58 = around 0.155172</output>

<result>9/58 = around 0.155172</result>