→ 111 + 111 = 6 => 1 + 1 + 1 + 1 + 1 + 1 = 6
→ 121 + 121 = 8 => 1 + 2 + 1 + 1 + 2 + 1 = 8
So,
→ 151 + 151 = x => 1 + 5 + 1 + 1 + 5 + 1 = 14 (Ans).
14 is Correct Logic ..
____________________
One More Logic :-
→ 111 + 111 = 222 => 2 + 2 + 2 = 6
→ 121 + 121 = 242 => 2 + 4 + 2 = 8
So,
→ 151 + 151 = 302 => 3 + 0 + 2 = 5 (Ans).