SOLUTION: joe has a test average of 87 in mathematics. IF his test average makes up 70 percent of his overall grade and the final exam makes up the remaining 30 percent, what must be his fin

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Question 1087214: joe has a test average of 87 in mathematics. IF his test average makes up 70 percent of his overall grade and the final exam makes up the remaining 30 percent, what must be his final exam score to give him an overall grade of exactly 90?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
joe has a test average of 87 in mathematics.
IF his test average makes up 70 percent of his overall grade and the final exam makes up the remaining 30 percent, what must be his final exam score to give him an overall grade of exactly 90?
:
the test average is 7/10 of the overall grade
the final exam is 3/10 of the overall grade
;
let x = final grade
%28%287%2887%29%2B3x%29%29%2F10 = 90
multiply both sides by 10
609 + 3x = 900
3x = 900 - 609
x = 291/3
x = 97% on the final to have a 90% for the overall grade