SOLUTION: kim had 78, 82, and 64 on her first three tests. What would be the lowest possible average on the next three exams so that Kim's grade in the class, based on the average of six ex

Algebra ->  Average -> SOLUTION: kim had 78, 82, and 64 on her first three tests. What would be the lowest possible average on the next three exams so that Kim's grade in the class, based on the average of six ex      Log On


   

Question 651980: kim had 78, 82, and 64 on her first three tests. What would be the lowest possible average on the next three exams so that Kim's grade in the class, based on the average of six exams, is a least 80?
How can I set up an algebraic equation and please show you came to a solution.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(78+82+64+3x)/6=80
224+3x=80*6
224+3x=480
3x=480-224
3x=256
x=256/3
x=85.3