SOLUTION: three numbers have an average of 15. if two numbers are 10 and 12, what is the other number?

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Question 677474: three numbers have an average of 15. if two numbers are 10 and 12, what is the other number?
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
%2810%2B12%2Bx%29%2F3+=+15
...
22%2Bx%29%2F3=15
...
22+x = 15(3)
...
22 + x = 45
x = 45-22
highlight_green%28x=23%29
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