SOLUTION: We have 3 test score (60+70+80) and we have taken 5 total test. We know the average of our test scores is 80. How do we find out the other 2 test scores?

Question 889012: We have 3 test score (60+70+80) and we have taken 5 total test. We know the average of our test scores is 80. How do we find out the other 2 test scores?
Found 2 solutions by stanbon, lwsshak3:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
We have 3 test score (60+70+80) and we have taken 5 total test. We know the average of our test scores is 80. How do we find out the other 2 test scores?
------
1st test score: x
2nd test score: y
--------
Equatiion:
(60+70+80+x+y)/5 = 80
210 + x + y = 400
x+y = 190
------
That is as far as you can go.
The sum of the unknown test scores must be 190.
Cheers,
Stan H.
----------------
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
We have 3 test score (60+70+80) and we have taken 5 total test. We know the average of our test scores is 80. How do we find out the other 2 test scores?**
***
let x=average of other 2 test scores

210+2x=5*80=400
2x=190
x=95
average of other 2 test scores=95
RELATED QUESTIONS
Jessica needs to have an average of 89 percent on her math tests to get an A-. If her... (answered by MathTherapy)
We make the claim that the mean test score on a statistics exam is 75 with σ = 5.... (answered by stanbon)
We have to figure out the equation and solve. Erin's test score is three points lower... (answered by JulietG,MathTherapy)
I have an average of 76 over a total of 3 tests. I need to score an overall average of at (answered by TimothyLamb)
Consider the following table of test scores. Test Score 90 80 70 60 50... (answered by Fombitz)
A man has had 6 brain scans done, but we only have 5 of his scores: The first five scores (answered by ankor@dixie-net.com)
Kate received a z score of 1 on a reading test. What do we know about Kate�s performance, (answered by jim_thompson5910)
Hi, I am trying to work out the total of my scores so I am able to know how much marks I (answered by jim_thompson5910)
A large group of students took a test in physics and the final grade have a mean of 70... (answered by Boreal)