There is a fraction, the numerator can be reduced to (1/4) by adding 1, and the denominator can be reduced to (1/5) by subtracting 1. What is the fraction?
有一个分数，分子加上1可以化简为(1/4)，分母减去1可以化简为(1/5)，这个分数是多少．
<gadget id="calculator">3 / 16</gadget>
<output>3/16 = around 0.1875</output>

<result>3/16 = around 0.1875</result>