There is a fraction, the denominator minus 1 can be reduced to (1/2), and the denominator plus 12 can be reduced to (1/3), then what is the fraction.
有一个分数，分母减1可约简为(1/2)，分母加12，可约简为(1/3)，则这个分数是多少．
<gadget id="calculator">27 - 1</gadget>
<output>26</output>

<gadget id="calculator">26 / 2</gadget>
<output>13</output>

<gadget id="calculator">13 / 27</gadget>
<output>13/27 = around 0.481481</output>

<result>13/27 = around 0.481481</result>