SOLUTION: Christina had scores of 78%, 87%, 67%, and 79%. What must she score on the fifth test (100 pt) to average at least 80%?

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: Christina had scores of 78%, 87%, 67%, and 79%. What must she score on the fifth test (100 pt) to average at least 80%?      Log On


   

Question 636794: Christina had scores of 78%, 87%, 67%, and 79%. What must she score on the fifth test (100 pt) to average at least 80%?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

(78 + 87 + 67 + 79 + x)/5    ≥  80

  78 + 87 + 67 + 79 + x   ≥  400    | Solve for x