Angie's class has 2 girls for every 3 boys. If there are 20 students in the class, how many girls are in Angie's class?
I know that the ratio of girls to boys is 2:3, which means that for every 5 students, 2 are girls and 3 are boys. I also know that there are 20 students in the class, which is four times as many as 5. So, I can multiply the number of girls in 5 students by 4 to get the number of girls in 20 students. That means there are 2 * 4 = 8 girls in Angie's class.

