In a class of students, the ratio of girls to boys is 2:5. If 4 more girls joined the class, the ratio would be 3:5. How many students are in the class? Choices.
A) 16
B) 20
C) 24
D) 28
E) 32
Let x be the number of students in the class.   (2/7)*x=(3/8)(x+4)-4   16x=21x+84-224   5x=140   x=28   The answer is 28.
<result>D</result>
In a class of students, the ratio of girls to boys is 2:5. If 4 more girls joined the class, the ratio would be 3:5. How many students are in the class?