There are 195 students in the sixth grade of the school who participated in the "Hundred Questions Without Mistakes" competition. The number of people who are all right accounts for (2/5), and (7/13) of the number of people who are all right are girls. How many girls are all right?
学校六年级有195人参加了"百题无差错"竞赛，全对人数占(2/5)，而全对人数中的(7/13)是女生，全对的女生人数是多少？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">195 * (2/5) * (7/13)</gadget>
<output>42</output>

<result>42</result>