SOLUTION: if my grades for the first three weeks of the month are 78, 66, and 84 what grade must i get to have an average of 80

Algebra ->  Percentage-and-ratio-word-problems -> SOLUTION: if my grades for the first three weeks of the month are 78, 66, and 84 what grade must i get to have an average of 80      Log On


   

Question 702773: if my grades for the first three weeks of the month are 78, 66, and 84 what grade must i get to have an average of 80
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
if my grades for the first three weeks of the month are 78, 66, and 84 what grade must i get to have an average of 80
-------------
(78 + 66 + 84 + G)/4 = 80
228 + G = 320
G = 92