SOLUTION: His test scores were 80, 88, 71, and 75. After his next test he found his average to be 78. What did he score on his fifth exam?

Algebra ->  Average -> SOLUTION: His test scores were 80, 88, 71, and 75. After his next test he found his average to be 78. What did he score on his fifth exam?      Log On


   

Question 325095: His test scores were 80, 88, 71, and 75. After his next test he found his average to be 78. What did he score on his fifth exam?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(80+88+71+75+x)/5=78
313+x/5=78
313+x=390
x=77