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

pls heeelp mee

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.

The year before the 10s so it was like when caveman were alive