SOLUTION: If Peter received grades of 88, 83, 75, and 80 on four tests in English, what is the minimum grade he has to score on the fifth test to have an average of at least 85 for the cours

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Question 177578: If Peter received grades of 88, 83, 75, and 80 on four tests in English, what is the minimum grade he has to score on the fifth test to have an average of at least 85 for the course. Use the five step method to solve.
Answer by Mathtut(3670) About Me  (Show Source):
You can put this solution on YOUR website!
well I am not sure what you five steps are.....I will leave that up to you, so here we go:
:
to find an average you total up all the terms and divide by the number of terms
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in our case:
:
%2888%2B83%2B75%2B80%2Bx%29%2F5%3E=85 where x is our unknown score
:
326%2Bx%3E=425added like terms on left and multiplied both sides by 5
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highlight%28x%3E=99%29after subtracting 326 from both sides
:
this dude is going to have to cook on the last test...gonna have to score a 99 or 100 to reach the goal