There is a fraction that adds 1 to the denominator equals (1/2), and subtracts 1 from the denominator equals (3/5). What is the fraction?
有个分数分母加上1等于(1/2)，分母减1等于(3/5)，这个分数是多少．
<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<result>6/11 = around 0.545455</result>