Aimin Primary School originally had 300 students. This semester, girls increased by 5%, boys increased by 4%, and the total number increased by 13. How many girls were there in Aimin Primary School? (column equation solution)
爱民小学原有学生300人，本学期女生增加了5%，男生增加了4%，共增加13人，爱民小学原来有女生多少人？(列方程解答)
<gadget id="calculator">1 / 100</gadget>
<output>1/100 = around 0.01</output>

<gadget id="calculator">1 / (1/100)</gadget>
<output>100</output>

<result>100</result>