SOLUTION: A student scores 86, 78, 91, 94, and 83 on five exams where 100 is perfect. The final exam counts as much as two regular exams. What score does the student have to make on the fina

Question 261043: A student scores 86, 78, 91, 94, and 83 on five exams where 100 is perfect. The final exam counts as much as two regular exams. What score does the student have to make on the final to have a 90% average for the course?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A student scores 86, 78, 91, 94, and 83 on five exams where 100 is perfect.
The final exam counts as much as two regular exams.
What score does the student have to make on the final to have a 90% average for the course?
:
Let x = final score
:
Counts as two so put it in the equation twice, then divide by 7
:
= 90
Multiply both sides by 7
432 + 2x = 7(90)
:
432 + 2x = 630
:
2x = 630 - 432
:
2x = 198
x =
x = 99 required on the final to average 90
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