The new semester started, and Zhang Yang found that the number of boys in the sixth grade increased by 10 compared with the previous semester, the number of girls decreased by 5% compared with the previous semester, and the total number of grades increased by 6 compared with the previous semester. How many girls were there in the sixth grade last semester?
新学期开学了，张杨发现：六年级的男生比上学期增加了10人，女生人数比上学期减少了5%，年级总人数比上学期多了6人．上学期六年级有女生多少人？
<gadget id="calculator">10 - 6</gadget>
<output>4</output>

<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">4 / (1/20)</gadget>
<output>80</output>

<result>80</result>