SOLUTION: If your first four test scores have been 89, 79, 75, and 81, what will you have to score on the fifth test to have an average of 80 for all test?

SOLUTION: If your first four test scores have been 89, 79, 75, and 81, what will you have to score on the fifth test to have an average of 80 for all test?

Algebra.Com

Question 727632:
If your first four test scores have been 89, 79, 75, and 81, what will you have to score on the fifth test to have an average of 80 for all test?
Answer by checkley79(3341) (Show Source): You can put this solution on YOUR website!
(89+79+75+81+x)/5=80
(324+x)/5=80
324+x=5*80
324+x=400
x=400-324
x=76 ans. for the fifth test score.
Proof:
(324+76)/5=80
400/5=80
80=80
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