There are 530 students in a certain elementary school, among which 20 girls and (1/9) boys participated in the "Spring Mathematics Contest". The remaining boys and girls are exactly equal. How many girls are there in this school?
某小学有学生530人，其中20位女生和(1/9)的男生去参加"迎春数学学竞赛"．剩下的男女生人数正好相等．这所学校的女生有多少人．
<gadget id="calculator">8 / 9</gadget>
<output>8/9 = around 0.888889</output>

<gadget id="calculator">1 + (8/9)</gadget>
<output>17/9 = around 1.888889</output>

<gadget id="calculator">510 / (17/9)</gadget>
<output>270</output>

<gadget id="calculator">530 - 270</gadget>
<output>260</output>

<result>260</result>