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There are four more girls than boys in Mr. Tse\textquotesingle s class of 28 students. What is the ratio of number of girls to the number of boys in her class? 
Overseas Competition->Knowledge Point->Calculation Modules->Ratios and Proportions
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) $4: 3$. 