SOLUTION: Sam must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75, 63, and 68. Write an inequality representing the score th

Algebra ->  Equations -> SOLUTION: Sam must have an average of 70 or more in his summer course to obtain a grade of C. His first three test grades were 75, 63, and 68. Write an inequality representing the score th      Log On


   

Question 95027: Sam must have an average of 70 or more in his summer course to
obtain a grade of C. His first three test grades were 75, 63, and 68. Write an inequality
representing the score that Sam must get on the last test to get a C grade.
Found 2 solutions by checkley71, tutorcecilia:
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
(75+63+68+X)/4=70 CROSS MULTIPLY.
75+63+68+X=280
X=280-206
X=74 MINIMUM GRADE TO HAVE A 'C' AVERAGE.

Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
Sam must have an average of 70 or more in his summer course to
obtain a grade of C. His first three test grades were 75, 63, and 68. Write an inequality
%2875%2B63%2B68%2Bx%29%2F4%29=70
%28206%2Bx%29%2F4%29=70
%28206%2Bx%29=(70)(4)
206+x=280
x=280-206
x=74
.
Checking:
%28206%2B74%29%2F4%29=70
%28280%2F4%29=70
70=70 [checks out]