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Take a step back for a moment and use algebra.
If we call the second number n, then we know that the average of m and n is A. In other words, (m + n)/2 = A... that is the definition of an average, since there are only two numbers.
If (m + n)/2 = A, then (m + n) = 2A. Since you want to find n, all you have to do is subtract out m.
m + n = 2A -----> n = 2A - m
Does that make sense?
I personally don't like math too much but I did tutor people for algebra back in 9th grade so I have a bit of experience with that, and I've taken math up to college-level calculus, so... If you need any help, just hit me up. ^^
Hope that helped. lol
I'll remember to ask you and see if you can help with other problems, because by the time I get to the hard ones, it's after class and the assignment's due the next day. 
















































































































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