SOLUTION: If the average score of 3 matches is 4 what must be score of the 4th game to bring the average to 5?

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Question 1089400: If the average score of 3 matches is 4 what must be score of the 4th game to bring the average to 5?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%28G%5B1%5D%2BG%5B2%5D%2BG%5B3%5D%29%2F3=4
So then,
G%5B1%5D%2BG%5B2%5D%2BG%5B3%5D=12
Adding D,
%28G%5B1%5D%2BG%5B2%5D%2BG%5B3%5D%2BG%5B4%5D%29%2F4=5
G%5B1%5D%2BG%5B2%5D%2BG%5B3%5D%2BG%5B4%5D=20
Substituting,
12%2BG%5B4%5D=20
Solve for G%5B4%5D.