SOLUTION: a student has test scoresof 80, 82, 94, 71. what score does the student need on the next test to produce an average score of 85?

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Question 99866: a student has test scoresof 80, 82, 94, 71. what score does the student need on the next test to produce an average score of 85?
Found 2 solutions by jim_thompson5910, checkley71:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
%2880%2B82%2B94%2B71%2Bx%29%2F5=85 Start with the given equation


80%2B82%2B94%2B71%2Bx=425 Multiply both sides by 5



x%2B327=425 Combine like terms on the left side


x=425-327Subtract 327 from both sides


x=98 Combine like terms on the right side

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Answer:
So our answer is x=98



So the student needs a 98 to have an average of 85

Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
(80+82+94+71+X)/5=85
(327+X)/5=85 NOW CROSS MULTIPLY
327+X=5*85
327+X=425
X=425-327
X=98 ANSWER FOR THE GRADE NEEDED ON THE FINAL TEST TO GET AN 85 AVERAGE.
PROOF
(80+82+94+71+98)/5=85
425/5=85
85=85