You would have to write an equation to solve this.
The elements are:
Total: 3907.50
Sunday's game = x
Thursday's game = x - 12.50
The question states that the combination of the Sunday and Thursday game equals the total, which is 3907.50
That would bring us to the equation: x + x - 12.50 = 3907.50
2x = 3920
x = 1960
To find Thursday's game, plug x into the equation. (Thursday's games = x - 12.50)
The answers are:
Sunday's game = 1960
Thursday's games = 1947.50