Answer:
The are 28 math majors in the class.
Step-by-step explanation:
We can solve this question using a rule of three.
The ratio of math majors to non math majors is 4 to 9
This means that 4+9 = 13 students, 4 are math majors.
The class has 91 students. How many are math majors?
13 students - 4 math majors
91 students - x math majors
[tex]13x = 4*91[/tex]
[tex]x = \frac{4*91}{13}[/tex]
[tex]x = 28[/tex]
The are 28 math majors in the class.
