SOLUTION: On his most recent quizzes, Carl earned a 75, a 77, and a 68. What minimum score would he need to earn on his next quiz to get an average of 80?

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Question 1088871: On his most recent quizzes, Carl earned a 75, a 77, and a 68. What minimum score would he need to earn on his next quiz to get an average of 80?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
A=80
%2875%2B77%2B68%2BT%29%2F4=80
220%2BT=320
Solve for T.