Answer :

Adding all the digits according to their places,


20 + B + 10A + B = 80 + A


9A + 2B = 60


9A = 60-2B


Since A and B both are whole numbers, 60-2B should be divisible by 9.


60-2B = 54 so B = 3.


Substituting B = 3 in 9A + 2B = 60,


we get A = 6.


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