Average score for all four bowling games?

In three bowling games, Alice scores 139, 143 and 144. What score will Alice need in a fourth game in order to have an average score of 145 for all four games?

MetroEye: Average Score = Sum of scores / Number of games

i.e; 145 = (139+143+144+S)/4
426+S = 145×4
S = 154

Hence Alice will need a score of 154 in the fourth game.