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?

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) (Show Source): You can put this solution on YOUR website!
Start with the given equation

Multiply both sides by 5

Combine like terms on the left side

Subtract 327 from both sides

Combine like terms on the right side

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Answer:
So our answer is

So the student needs a 98 to have an average of 85
Answer by checkley71(8403) (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
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