There is a fraction. If 1 is added to the numerator, the fraction becomes (1/2). If 1 is subtracted from the numerator, the fraction becomes (3/8). What is the original fraction?
有一个分数，如果分子加上1，这个分数变成(1/2)，如果分子减去1，这个数变成(3/8)，原分数是多少．
<gadget id="calculator">7 / 16</gadget>
<output>7/16 = around 0.4375</output>

<result>7/16 = around 0.4375</result>