2025 Cayley Problem 16

A jar contains 600 marbles, each of which is either red, yellow, or green. The ratio of the number of red marbles to the number of yellow marbles to the number of green marbles is 7 : 3 : 5. If 20 marbles of each colour are removed, the new ratio of the number of red marbles to the number of yellow marbles to number of green marbles is

\textbf{(A)}\ 5 : 1 : 3\quad \textbf{(B)}\ 15 : 7 : 11\quad \textbf{(C)}\ 13 : 5 : 9\quad \textbf{(D)}\ 9 : 5 : 7\quad \textbf{(E)}\ 209 : 89 : 149

If there are no answer choices shown, enter a numerical answer.

Full credit to this problem is given to the CEMC, you may view all Cayley contests here.