The numerator and denominator of a true fraction are relatively prime. If its numerator is enlarged by 3 times and the denominator is increased by 8, the value of the fraction remains unchanged. What is the true fraction?
一个真分数的分子与分母互质，将它的分子扩大3倍，分母增加8以后，分数的值不变，这个真分数是多少？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>