Danny scored 10 points in the first round of a game. he then lost 20 points in the second round. in the final round he earned 40 points. what was danny's score at the end of the game

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Danny's score at the end of the game is 30 because:
We started our with 10 points. 
He loses 20 points, which brings him down to -10 points. 
In the final round he earned 40 points. 40 minus the negative ten points gives us an answer of 30 points.