There are 25 boys in class 6 and 2, and the number of girls is 80% of the boys. How many girls are there?
六2班有男生25人，女生人数是男生的80%，女生有多少人？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">25 * (4/5)</gadget>
<output>20</output>

<result>20</result>