The ratio of the number of boys and girls in a certain elementary school is 16:13. Later, some girls transferred to this school, and the ratio of boys and girls changed to 6:5. At this time, there are 880 students in the whole school. How many girls are there?
某小学男女生人数之比是16：13，后来有几位女生转学到这所学校，男女生人数之比变为6：5，此时全校学生共880人，转来的女生有多少人．
<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">880 * (6/11)</gadget>
<output>480</output>

<gadget id="calculator">880 - 480</gadget>
<output>400</output>

<gadget id="calculator">13 / 16</gadget>
<output>13/16 = around 0.8125</output>

<gadget id="calculator">480 * (13/16)</gadget>
<output>390</output>

<gadget id="calculator">400 - 390</gadget>
<output>10</output>

<result>10</result>