There is a fraction. If 1 is added to the numerator and denominator, the fraction becomes (1/2). If 1 is subtracted from the numerator and denominator, the fraction becomes (2/5). What is the fraction?
有一个分数，如果分子分母都加上1，则分数变为(1/2)，如分子分母都减1，则分数变为(2/5)，这个分数是多少．
<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<result>5/11 = around 0.454545</result>