For a simple fraction, the difference between the numerator and the denominator is 20. If 9 is added to the numerator and 9 is subtracted from the denominator, (8/9) is obtained. What is the original simple fraction?
一个最简分数，分子与分母相差20，如果分子加上9，分母减去9，就得到(8/9)，原来这个最简分数是多少．
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">(8/9) * 20</gadget>
<output>160/9 = around 17.777778</output>

<gadget id="calculator">(8/9) * 9</gadget>
<output>8</output>

<gadget id="calculator">(160/9) - 9 - 8</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">1 - (8/9)</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">(7/9) / (1/9)</gadget>
<output>7</output>

<gadget id="calculator">7 + 20</gadget>
<output>27</output>

<gadget id="calculator">(7/9) / (1/9) / 27</gadget>
<output>7/27 = around 0.259259</output>

<result>7/27 = around 0.259259</result>