SOLUTION: Your composite grade in a course is 80% if your current grade, plus 20% of your final exam score. Your current grade is 83 and your goal is to get a composite grade of 85 or better

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Question 644944: Your composite grade in a course is 80% if your current grade, plus 20% of your final exam score. Your current grade is 83 and your goal is to get a composite grade of 85 or better. Write and solve and inequality to find the final exam scores that will meet your goal.
I tried setting up and solving the problem:
.80x + 83 <85
- 83 -83
.80x= 2
x< 2.5
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Your composite grade in a course is 80% if your current grade, plus 20%
of your final exam score.
Your current grade is 83 and your goal is to get a composite grade of
85 or better.
Write and solve and inequality to find the final exam scores that will
meet your goal.
:
You have to weight the two grades in a ratio of 8:2
Let x = the required exam score
:
%288%2883%29%2B2x%29%2F10 => 85
multiply both sides by 10, find 8*83
664 + 2x => 850
2x => 850 - 664
2x => 186
x => 186/2
x => 93 to get a composite grade of 85