Add 1 to the numerator and denominator of a fraction to get (1/3), and subtract 1 to get (1/4), then what is the fraction.
一个分数的分子、分母各加上1得(1/3)，各减去1得(1/4)，则这个分数是多少．
<gadget id="calculator">5 / 17</gadget>
<output>5/17 = around 0.294118</output>

<result>5/17 = around 0.294118</result>