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?

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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(499) 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.