Question 809645: I have an average of 76 over a total of 3 tests. I need to score an overall average of at least 80 with all four tests. What score do I need on my fourth and final test to obtain an overall average of 80? (I do not know the individual test scores of the first 3 tests.)
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! (76/3 + f)/4 = 80
76/3 + f = 320
f = 320 - 76/3
f = 960/3 - 76/3
f = 884/3
f = 294.7
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Answer:
Trick question:
You need to score 294.7 on the final, but can't do that assuming the max test score is 100, so you can't bring your average score up to 80 after the 4th test. Sorry!
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