2020 Cayley Problem 15

A bag contains only green, yellow and red marbles. The ratio of green marbles to yellow marbles to red marbles in the bag is 3:4:2. If 63 of the marbles in the bag are *not* red, the number of red marbles in the bag is

\textbf{(A)}\ 14\quad \textbf{(B)}\ 18\quad \textbf{(C)}\ 27\quad \textbf{(D)}\ 36\quad \textbf{(E)}\ 81

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.