SOLUTION: Sarah has gotten scores of 83, 76, and 69 on her first three tests. What score must she get on her fourth test to keep an average of 81 or greater?
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Question 292648: Sarah has gotten scores of 83, 76, and 69 on her first three tests. What score must she get on her fourth test to keep an average of 81 or greater? Answer by checkley77(12844) (Show Source):
You can put this solution on YOUR website! (83+76+69+x)/4>=81
(228+x)/4>=81
228+x>=4*81
228+x>=324
x>=324-228
x>=96 ans. for the minimum grade on the fourth test to maintain the 81 ave.
Proof:
Let x=96
(83+76+69+96)/4>=81
324/4=81
81=81
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