At Randy Barcelona High, the total number of girls in the combined junior and senior classes is equal to the number if boys in those two classes. If the senior class has 400 students and the junior class has 300 students and if the ratio of boys togirls in the senior class is 5 to 3, what is the ratio of boys to girls in junior classes? A. 2:5 B. 1:2 C. 5:9 D. 5:7

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