There are 429 primary school students participating in the mathematics winter camp, and the ratio of boys to girls is 7:6. Later, some girls signed up for the competition. At this time, the ratio of boys to girls became 11:10. I would like to ask: How many girls will sign up later?
有429名小学生参加数学冬令营，其中男生和女生的人数比为7：6．后来又有一些女生报名参赛，这时男生和女生的人数比变为11：10．请问：后来报名的女生有多少人？
<gadget id="calculator">7 + 6</gadget>
<output>13</output>

<gadget id="calculator">429 / 13</gadget>
<output>33</output>

<gadget id="calculator">7 / 11</gadget>
<output>7/11 = around 0.636364</output>

<gadget id="calculator">11 + 10</gadget>
<output>21</output>

<gadget id="calculator">33 * (7/11) * 21</gadget>
<output>441</output>

<gadget id="calculator">441 - 429</gadget>
<output>12</output>

<result>12</result>