Question 835590: The average a,b, and c is 15. The average of a and b is 18. What is the value of c?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! The average a,b, and c is 15. The average of a and b is 18. What is the value of c?
-------
Equations:
(a+b)/2 = 18
So, a+b = 36
-------
(a+b+c)/3 = 15
So, a+b+c = 45
----
Substitute for "a+b" and solve for "c":
36 + c = 45
c = 9
===============
Cheers,
Stan H.
=================
|
|
|
