If the number of boys in the art interest group is 2/5 of the number of girls, then how much do the number of girls account for in the total number of art interest groups?
美术兴趣小组中男生人数是女生人数的(2/5)，那么女生人数占美术兴趣小组总人数的多少．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">1 / (7/5)</gadget>
<output>5/7 = around 0.714286</output>

<result>5/7 = around 0.714286</result>