SOLUTION: A student has an average of 72 on four exams. If the final exam is to count double, what score does she need to have an averge of 80?
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Question 453970: A student has an average of 72 on four exams. If the final exam is to count double, what score does she need to have an averge of 80? Found 2 solutions by richwmiller, solver91311:Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! (4*72+2x)/6=80
x=96
at least a score of 96
another way
72 misses 80 by 8
4*8=32
32/2=16
16+80=96
If his current average is 72 for 4 exams, then his total points have to be 4 times 72.
If his final average for 4 exams plus a final that counts for 2 exams must be 80, then his final point total must be 6 times 80.
Subtract his current point total from his needed final total giving you the points he needs to achieve. Since the final counts as 2, this number will be 2 times the score he needs on the final.
John
My calculator said it, I believe it, that settles it
