SOLUTION: Jim has gotten scores of 81 and 67 on his first two tests. What score must he get on his third test to keep an average of 75 or greater?

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Jim has gotten scores of 81 and 67 on his first two tests. What score must he get on his third test to keep an average of 75 or greater?      Log On


   

Question 352045: Jim has gotten scores of 81 and 67 on his first two tests. What score must he
get on his third test to keep an average of 75 or greater?
Found 2 solutions by edjones, Fombitz:
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
(81+67+x)/3>=75
81+67+x>=225 multiply each side by 3.
148+x>=225
x>=77
.
Ed

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let Z be his next score.
%2881%2B67%2BZ%29%2F3%3E=75
148%2BZ%3E=225
highlight%28Z%3E=77%29