SOLUTION: Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number?

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Question 677396: Three of four numbers have a sum of 22. If the average of the four numbers is 8, what is the fourth number?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Three of four numbers have a sum of 22.
a + b + c = 22
:
If the average of the four numbers is 8,
%28a+%2B+b+%2B+c+%2B+d%29%2F4 = 8
Replace a + b + c with 22
%2822+%2B+d%29%2F4 = 8
multiply both sides by 4
22 + d = 32
d = 32 - 22
d = 10 is the fourth number?