SOLUTION: Louise scored 74%, 77% and 92% on his first algebra tests. What does he need on his 4th algebra test to maintain an average of 80 percent?

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Question 981264: Louise scored 74%, 77% and 92% on his first algebra tests. What does he need on his 4th algebra test to maintain an average of 80 percent?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

%2874%2B77%2B92%2Bx%29%2F4=80
74%2B77%2B92%2Bx=80%2A4
243%2Bx=320
x=320-243
x=77=>he need 77percent on his 4th algebra test to maintain an average of 80 percent