A group of interest girls accounted for (2/5), and later transferred 4 girls, at this time girls accounted for the total number of people (5/11), how many people were there in this interest group?
一个兴趣小组女生占(2/5)，后来又转来4名女生，这时女生占总人数的(5/11)，这个兴趣小组原来有多少人？
<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">(5/11) * 4</gadget>
<output>20/11 = around 1.818182</output>

<gadget id="calculator">4 - (20/11)</gadget>
<output>24/11 = around 2.181818</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/11) - (2/5)</gadget>
<output>3/55 = around 0.054545</output>

<gadget id="calculator">(24/11) / (3/55)</gadget>
<output>40</output>

<result>40</result>