SOLUTION: Fred has test scores of 79,78,82 and 86. What is the lowest score he can get on his 5th test to still average 80%?

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Fred has test scores of 79,78,82 and 86. What is the lowest score he can get on his 5th test to still average 80%?      Log On


   

Question 313341: Fred has test scores of 79,78,82 and 86. What is the lowest score he can get on his 5th test to still average 80%?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
%2879%2B78%2B82%2B86%2BX%29%2F5=80
325%2BX=400
X=75
If he scores a 75, he'll have an 80 average.