Removing my averages thanks for your time and apologies if this is far too simple for this group. 
I am trying to remove my average from a total average.  Meaning:
The total average for a subset of data is 55.  I am 29% of this subset and my average is 52.  
If I were to remove myself from the equation, how could I find the average of the remaining 71% without me?

Let $x$ represent the average of the $71\%$ subset.  Then the following equation holds:
$$(0.29) \cdot 52 + (0.71) \cdot x = 55$$
Does that make sense, and can you take it from here?
