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Mathematical problems of playing go in grade three
The average score of former 10 players is a, and the total score of former 10 players is 10a.

The average score of the top 8 masters is B, and the sum of the top 8 scores is 8b.

So the total score of the 9th, 10 is (10a-8b).

If the ninth player scores more C points than the10th player, let the10th player score X,

There is an equation X+X+c= 10a-8b.

Solution: X=( 10a-8b-c)/2.