Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

In a class of 80 seniors, there are 3 boys for every 5 girls. In the junior class, there are 3 boys for every 2 girls. If the two classes combined have an equal number of boys and girls, how many students are in the junior class?

(A) 72

(B) 80

(C) 84

(D) 100

(E) 120