SOLUTION: A student has scores of 86.5, 87, and 91.5 on his first three tests. He needs an average of at least 90 to earn a grade of A. What is the minimum score that the student needs on th

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A student has scores of 86.5, 87, and 91.5 on his first three tests. He needs an average of at least 90 to earn a grade of A. What is the minimum score that the student needs on th      Log On


   

Question 785660: A student has scores of 86.5, 87, and 91.5 on his first three tests. He needs an average of at least 90 to earn a grade of A. What is the minimum score that the student needs on the fourth test to ensure a A?
Answer by xinxin(76) About Me  (Show Source):
You can put this solution on YOUR website!
Suppose he needs to get a minimum score of X, then
(86.5+87+91.5+X)/4=90
X=360-86.5-87-91.5=95
He needs the score of 95 to ensure a A.