SOLUTION: Hello, I need help defining a variable, writing and solving this inequality: Ray had scores of 75,82,94, and 77 on his first four science tests. What must he score on the

Algebra ->  Inequalities -> SOLUTION: Hello, I need help defining a variable, writing and solving this inequality: Ray had scores of 75,82,94, and 77 on his first four science tests. What must he score on the       Log On


   

Question 91692: Hello,

I need help defining a variable, writing and solving this inequality:
Ray had scores of 75,82,94, and 77 on his first four science tests. What must he score on the next test to have an average of at least 85?

Thank you
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
need help defining a variable, writing and solving this inequality:
Ray had scores of 75,82,94, and 77 on his first four science tests. What must he score on the next test to have an average of at least 85?
:
Let x = the score required on the 5th test to have at least an 85 average:
:
%28%28x+%2B+75+%2B+82+%2B+94+%2B+77+%29%29%2F5 => 85

%28%28x+%2B+328%29%29%2F5 => 85
:
Multiply equation by 5 and you have:
x + 328 => 5(85)
:
x + 328 => 425
:
x => 425 - 328
:
x => 97 required
:
:
Check on calc: (97+75+82+94+77)/5 = 85