We can set up an equation with $x$ being the number of girls in the class. The number of boys in the class is equal to $x-4$. Since the total number of students is equal to 28 , we get $x+x-4=28$. Solving this equation, we get $x=16$. There are $16-4=12$ boys in our class, and our answer is $16: 12=$ (B) $4: 3$. 
There are four more girls than boys in Ms. Raub\textquotesingle s class of 28 students. What is the ratio of number of girls to the number of boys in her class? (2014 AMC 8, Question 7) 
Options:
[1] $3:4$ 
[2] $4:3$ 
[3] $3:2$ 
[4] $7:4$ 
[5] $2:1$ 