A fraction converted into the simplest fraction is (4/13), and the numerator of the original fraction is expanded to 4 times the original fraction, which is 96. What is the denominator of the original fraction?
一个分数化成最简分数是(4/13)，原分数的分子扩大为原来的4倍后是96，那么原分数的分母是多少．
<gadget id="calculator">4 / 13</gadget>
<output>4/13 = around 0.307692</output>

<result>4/13 = around 0.307692</result>