Need-your-help-with-this-Math-word-problem

Over 12 games, a baseball team scored an average of 6 runs per game. If their average number of runs in the first 10 games was 5 and they scored the same number of runs in each of the last two games, how many runs did they score in the last game? Please explain how you arrived at your answer. Step-by-step procedures will be greatly appreciated.