1999 Pascal Problem 19

The numbers 49, 29, 9, 40, 22, 15, 53, 33, 13, 47 are grouped in pairs so that the sum of each pair is the same. Which number is paired with 15?

\textbf{(A)}\ 33\quad \textbf{(B)}\ 40\quad \textbf{(C)}\ 47\quad \textbf{(D)}\ 49\quad \textbf{(E)}\ 53

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 Pascal contests here.