SOLUTION: A student has grades on three examinations of 76, 80, and 72. What must the student earn on a fourth examination in order to have an average of at least 80?

Algebra ->  Customizable Word Problem Solvers  -> Numbers -> SOLUTION: A student has grades on three examinations of 76, 80, and 72. What must the student earn on a fourth examination in order to have an average of at least 80?       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 511: A student has grades on three examinations of 76, 80, and 72. What
must the student earn on a fourth examination in order to have an
average of at least 80?
Answer by ichudov(507) About Me  (Show Source):
You can put this solution on YOUR website!
the average of four grades is +%2876%2B80%2B72%2Bfourth_grade%29%2F4+. If it is 80, we have a nice equation +%2876%2B80%2B72%2Bfourth_grade%29%2F4+=+80+, or +76%2B80%2B72%2Bfourth_grade+=+320. Solve it.