CEMC Pascal, 2007

Algebra Difficulty 1.0 Junior Find the answer Canada

At Webster High School, the ratio of males to females writing the Pascal Contest is $3:7$ . If there are $21$ males writing the Contest, what is the total number of students writing?

(A) $30$ (B) $25$ (C) $49$ (D) $70$ (E) $79$

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