1. The mean mass of the 15 players in a rugby team is 85.2kg. The mean mass of the team plus a substitute is 85.4kg. What is the mass of the substitute?
2. After 8 matches, a basketball player has a mean of 27 points. After 10 matches, his mean was 31 points. How many points in total did he score in his last 2 matches?
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