SOLUTION: She has test scores of 65,78,81,82and 90. What must be scores on her 6 test to maintain an average score of 80?

Algebra ->  Average -> SOLUTION: She has test scores of 65,78,81,82and 90. What must be scores on her 6 test to maintain an average score of 80?       Log On


   

Question 972274: She has test scores of 65,78,81,82and 90. What must be scores on her 6 test to maintain an average score of 80?
Answer by amarjeeth123(570) About Me  (Show Source):
You can put this solution on YOUR website!
Let the test score on the 6th test be x.
Then we have (65+78+81+82+90+x)/6=80
(396+x)/6=80
396+x=480
x=480-396=84
She must get 84 on her 6th test to get an average of 80.