SOLUTION: On your first four tests you scored 80%,76%,99% and 91%. What do you have to get on the final test to average at least an 80% for the course?

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Question 367014: On your first four tests you scored 80%,76%,99% and 91%. What do you have to get on the final test to average at least an 80% for the course?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let X be the final test score,
%2880%2B76%2B99%2B91%2BX%29%2F5%3E=80
346%2BX%3E=400
highlight%28X%3E=54%29