Answer :

maxday
The difference between them is 2, so let the unknown numbers be x and (x+2). 

Their sum is 52, so: 
52 = x + (x+2) 
52 = x + x + 2 
50 = x + x 
50 = 2x 
25 = x 

So your unknown numbers x and (x+2) are 25 and 27.

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