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?

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.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) (Show Source): You can put this solution on YOUR website!
the average of four grades is . If it is 80, we have a nice equation , or . Solve it.
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