Video "Only 1 In 1000 Can Solve" The Viral 1 + 4 = 5 Puzzle. The Correct Answer Explained

This problem was shared on Facebook with the claim that only one in a thousand could figure it out. It went viral and generated over 3 million comments. Here is the problem. If 1 + 4 = 5, 2 + 5 = 12, 3 + 6 = 21, what is 8 + 11 = ? This video presents what many people believe to be the correct answer.

Blog post (text explanation and an extra proof): http://wp.me/p6aMk-4OH

Facebook post that went viral
https://www.facebook.com/randall.joneslatinjuggalo/posts/1048238075247858

Telegraph coverage
http://www.telegraph.co.uk/education/2016/04/22/this-maths-problem-has-thousands-of-people-baffled-can-you-work/

Reddit Puzzles
https://www.reddit.com/r/puzzles/comments/4gbxst/how_to_come_up_with_the_most_correct_answer_on_a/

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