In a class, there are 30 boys and 60 girls. What is the ratio of boys to the total number of students in the class?
The ratio of number of boys and girls is 4 : 3. If there are 18 girls in a class, find the number of boys in the class and the total number of students in the class.
There are 20 girls and 15 boys in a class.
What is the ratio of girls to that total number of students in the class?