A certain class organized a mathematics interest group. The ratio of males to females was 3:2. Later, 2 females were added. At this time, the ratio of males to females was 5:4. How many people are there in this interest group?
某班组织了一个数学兴趣小组，男、女生人数比是3：2，后来增加了2名女生，这时男、女生人数比是5：4，这时这个兴趣小组共有多少人．
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">(4/5) - (2/3)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">2 / (2/15)</gadget>
<output>15</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">9 / 5</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">15 * (9/5)</gadget>
<output>27</output>

<result>27</result>