SOLUTION: The mean of four numbers is 12. The mean of three of the numbers is 13. What is the fourth number?

Algebra ->  Average -> SOLUTION: The mean of four numbers is 12. The mean of three of the numbers is 13. What is the fourth number?      Log On


   

Question 893205: The mean of four numbers is 12. The mean of three of the numbers is 13. What is the fourth number?
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
(13+13+13+x)/4=12
39+x=12*4
x=48-39
x=9