2001 Gauss 7 Problem 10

Henri scored a total of 20 points in his basketball team's first three games. He scored \frac{1}{2} of these points in the first game and \frac{1}{10} of these points in the second game. How many points did he score in the third game?

\textbf{(A)}\ 2\quad \textbf{(B)}\ 10\quad \textbf{(C)}\ 11\quad \textbf{(D)}\ 12\quad \textbf{(E)}\ 8

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 Gauss contests here.