In the happy reading group, the number of girls accounted for (3/8). Later, 4 girls were added. At this time, girls accounted for (4/9) of the group. How many students were there in this interest group?
快乐阅读小组中，女生人数占(3/8)，后来又增加了4名女生，这时女生占小组人数的(4/9)，这个兴趣小组原有学生多少人？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">1 - (4/9)</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">(4/9) / (5/9)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">(3/8) / (5/8)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(4/5) - (3/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5) / (5/8)</gadget>
<output>32</output>

<result>32</result>