SOLUTION: David has scored 81, 89, 94, and 81 on his previous four tests. What score does he need on his next test so that his average (mean) is 81 ?

Algebra ->  Average -> SOLUTION: David has scored 81, 89, 94, and 81 on his previous four tests. What score does he need on his next test so that his average (mean) is 81 ?      Log On


   

Question 663956: David has scored 81, 89, 94, and 81 on his previous four tests. What score does he need on his next test so that his average (mean) is 81 ?
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
Just in case you are yet in need of a solution...
%2881%2B89%2B94%2B81%2Bx%29%2F5+=+81
Combine like terms
%28345+%2B+x%29%2F5+=+81
Multiply both sides by 5
345+x = 405
Group like terms
x = 405 - 345 = 60
x=60 is the next score for an average of 81
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