There are 36 boys and girls in the school mathematics interest group, of which boys accounted for (5/9), and later boys joined. Now the ratio of the number of boys to the number of girls is 2:1. How many people are there in the Mathematics Interest Group?
学校数学兴趣小组有男生和女生共36人，其中男生占(5/9)，后来又有男生参加，现在男生人数和女生人数的比是2：1．现在数学兴趣小组共有多少人？
<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(4/9) / (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">36 * (4/3)</gadget>
<output>48</output>

<result>48</result>