The three groups have the same number of people. The number of boys in the first group is equal to the number of girls in the second group. The number of boys in the third group is the sum of the number of boys in the three groups (2/5). The total number of boys in the three groups is three What percentage of the total number of people in the group?
三个小组的人数一样多，第一小组男生数等于第二小组女生数，第三小组的男生数是三个小组男生数总和的(2/5)，问三个小组的男生总数占三个小组总人数的几分之几？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / (3/5) / 3</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>