There are 240 students in the sixth grade in a certain school, among which girls accounted for (5/12), and later some girls were transferred. At this time, girls accounted for (6/13), how many girls were transferred?
某校六年级有学生240人，其中女生占(5/12)，后来又转来女生若干名，这时女生占(6/13)，转来多少名女生？
<gadget id="calculator">5 / 12</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">240 * (5/12)</gadget>
<output>100</output>

<gadget id="calculator">240 - 100</gadget>
<output>140</output>

<gadget id="calculator">6 / 13</gadget>
<output>6/13 = around 0.461538</output>

<gadget id="calculator">1 - (6/13)</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">140 / (7/13)</gadget>
<output>260</output>

<gadget id="calculator">260 - 240</gadget>
<output>20</output>

<result>20</result>