There are 256 students in the sixth grade, and some (5/8) have participated in the mathematics interest group, and (2/5) of the students participating in the mathematics interest group are boys. What percentage of the total number of girls in the sixth grade is the number of girls participating in the mathematics interest group ?
六年级有学生256人，有(5/8)参加了数学兴趣小组，参加数学兴趣小组的学生(2/5)是男生，求参加数学兴趣小组的女生占六年级总人数的几分之几？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<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 * (5/8) * (3/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>