SOLUTION: The average (arithmetic mean) of two numbers is h. If one of the two numbers is 12, what is the other?

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Question 946549: The average (arithmetic mean) of two numbers is h. If one of the two numbers is 12, what is the other?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let's call the number X.
%28X%2B12%29%2F2=h
X%2B12=2h
X=2h-12