To find the percentage amount of girls in the class, we need to first find the amount of girls in the class.
Since 16 of the 25 students are boys, the rest must be girls. Subtract 16 from 25 to find the amount of girls in class.
25-16=9
Now, to find out what percent of 25 9 is, divide 9 by 25.
9/25= .36
The percentage of girls in the class was 36%.
Hope this helps!