AB+ AB+ B BB
A=
B + B + B = B → on adding B three times, we are getting B again at unit's place. This is only possible if B is either 0 or 5.
0 + 0 + 0 = 0 and 5 + 5 + 5 = 15;
So, 1 is carry. The answer is BB i.e., 55.
∴ Now we have
1 + A + A = 5
2A = 4
A = 2