Question 640865: Going into the final exam, which will count as two tests, Amelia has test scores of 75, 84, 70, 63, and 94. What score does Amelia need on the final in order to have an average score of 80?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Going into the final exam, which will count as two tests, Amelia has test
scores of 75, 84, 70, 63, and 94.
What score does Amelia need on the final in order to have an average score
of 80?
:
Let x = final test score
Final counts a two test; put it in the equation as 2x:
:
 = 80
add up the scores and multiply both sides by 7
2x + 386 = 7(80)
2x = 560 - 386
2x = 174
x = 174/2
x = 87% on the final, gives an average of 80
|
|
|
