SOLUTION: a student scores 82%,86% and 78% on her three exams. What score is needed on the fourth exam for the student to have an average of 85% for all four exams ?

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Question 651368: a student scores 82%,86% and 78% on her three exams. What score is needed on the fourth exam for the student to have an average of 85% for all four exams ?
Found 2 solutions by ewatrrr, Aaniya:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,  

a student scores 82%,86% and 78% on her three exams. 

What scorehighlight%28x%29 is needed on the fourth exam for the student to have an average of 85% for all four exams

  %2882+%2B+86+%2B+78+%2B+x%29%2F4+=+85 solve for x

Answer by Aaniya(63) About Me  (Show Source):
You can put this solution on YOUR website!
score will be 94
82,86,78,94 =340
divide by your 4 exams=85