SOLUTION: A student received grades if 75 and 81 on the first two exams. What grade must the student ear on the last exam to get an average of no less than 80?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A student received grades if 75 and 81 on the first two exams. What grade must the student ear on the last exam to get an average of no less than 80?      Log On


   

Question 636153: A student received grades if 75 and 81 on the first two exams. What grade must the student ear on the last exam to get an average of no less than 80?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
Let x - the grade of the third exam
%2875%2B81%2Bx%29%2F3%3E=80 multiply by 3
156%2Bx%3E=240
x%3E=84
A student must ear on the last exam no less than 84