SOLUTION: Thanh has scores of 57, 85, 67, and 75 on his first four math exams. What score must he make on the fifth exam to have an average of 70 or better for the five exams?

Algebra ->  Average -> SOLUTION: Thanh has scores of 57, 85, 67, and 75 on his first four math exams. What score must he make on the fifth exam to have an average of 70 or better for the five exams?      Log On


   

Question 583088: Thanh has scores of 57, 85, 67, and 75 on his first four math exams. What score must he make on the fifth exam to have an average of 70 or better for the five exams?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
%2857%2B85%2B67%2B75%2Bx%29%2F5=70 add like terms and multiply by 5
284%2Bx=350 subtract 284
x=66