SOLUTION: I am supposed to solve this question using variables. I have to write it in an outline format, so it is confusing to me because I can solve it without using variables. Here is the

Question 1069680: I am supposed to solve this question using variables. I have to write it in an outline format, so it is confusing to me because I can solve it without using variables. Here is the problem:
In order to receive an A in a college course it is necessary to obtain an average of 90% correct on three 1-hour exams of 100 points each and on one final exam of 200 points. If a student scores 82, 88, and 91 on the 1-hour exams, what is the minimum score that the person can receive on the final exam and still earn an A?
So for the three 1-hour exams, the total possible points are 300 and the student got 261/300 = 87%. So for the final exam of 200 points, they would need to get a minimum of 189/200 = 95%, to bring the total to 450/500 = 90%. Now I just don't know how to put all that into a variable form to make it an "x+y" type problem :-/
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
The final exam is equivalent to two regular 100-point exams.
That means, 3 regular + 2 regular = 5 regular, examinations.
Emphasis for grading is on the average for the three regular plus one final tests. Target minimum percent average for grade A is 90%.

This should be the equation to solve; and understand you can say in place of the in the numerator. The variable , x, is the score on the final exam. Remember, this final exam counts as TWO regular tests.

Same as ;
Just SOLVE for x.
That will be the minimum score needed to get average 90% on all the tests plus final.
RELATED QUESTIONS
Please help me solve this problem. I tried to do it all different ways and am completely... (answered by Theo,greenestamps)

Factor and check by multiplying x^8 + 3x^7 just Factor: 81c^6 - 3d^6 Are... (answered by richwmiller)

Hi, I am banging my head on the desk over this one. And to top it off : ( I can't seem... (answered by stanbon)

I am trying to solve a system of equations with three variables. 6x-y+2z=-14 x+2y-z=-2 (answered by ewatrrr)

Hello. I would like some help not only in finding the answer for this particular... (answered by stanbon)

I am having a hard time on a question on my math homework. The question is -7m + 3m = 8... (answered by josgarithmetic)

I am a parent I want to help my child but i don't know how to do this. I'm not asking for (answered by Alan3354,josmiceli,ankor@dixie-net.com)

okay... :) I am in 8th grade and curently takeing Algebra 1. We are working on solveing... (answered by Alan3354)

Garmin's yearly net sales between 2000 and 2008 can be modeled by y=191,525e^0.3162x... (answered by rothauserc,Theo)