There is a fraction. If the numerator is increased by 2, the fraction is equal to (1/2). If the denominator is increased by 1, the fraction is equal to (3/7). What is the fraction?
有一个分数，如果分子增加2，这个分数就等于(1/2)，如果分母增加1，这个分数就等于(3/7)，这个分数是多少．
<gadget id="calculator">15 / 34</gadget>
<output>15/34 = around 0.441176</output>

<result>15/34 = around 0.441176</result>