There are 42 people in the sixth grade interest group, of which boys accounted for (4/7), and some girls were added later. At this time, the ratio of boys to girls was 6:5. How many girls are there in this interest group now?
六年级兴趣小组有42人，其中男生占(4/7)，后来又进了若干名女生，这时男生与女生的比是6：5，现在这兴趣小组有女生多少人？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<gadget id="calculator">6 / 11</gadget>
<output>6/11 = around 0.545455</output>

<gadget id="calculator">(4/7) / (6/11)</gadget>
<output>22/21 = around 1.047619</output>

<gadget id="calculator">5 / 11</gadget>
<output>5/11 = around 0.454545</output>

<gadget id="calculator">42 * (22/21) * (5/11)</gadget>
<output>20</output>

<result>20</result>