IF 1 + 4 = 5, 2 + 5 = 12 THEN 8 + 11 = ?

Number Puzzle : IF 1 + 4 = 5 THEN 8 + 11 = ?

Can you solve this viral number puzzle. A big debate is going on over internet between two possible answer.

Lets see you you come up with the same or different answer or give up all together.

1 + 4 = 5

2 + 5 = 12

3 + 6 = 21

8 + 11 = ?

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