Problem:
The ratio of boys to girls in Mr. Brown's math class is . If there are  students in the class, how many more girls than boys are in the class?
Answer Choices:
A.  
B.  
C.  
D.  
E.  
Solution:
Since the ratio is of the students are boys and of them are girls. Thus there are more girls than boys and .
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions