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I need to figure out some averages for some javascript I'm writing. The data I have is:

  • I know the average of $a$, $b$ and $c$.
  • I know the value of $c$.
  • I do not know the values of $a$ and $b$.

What I need to know is the average of $a$ and $b$. It must be possible, but I can't figure it out.

2 Answers 2