There used to be 300 students in the primary school. This semester, the number of girls increased by 5%, and the number of boys increased by 4%, a total of 13 students increased. How many girls are there in a small school?
一小原来有学生300人，本学期女生增加了5%，男生增加了4%，共增加了13人．一小原来有女生多少人？
<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>