This problem has been shared millions of times on Twitter/Facebook with the claim "99% fail" to solve it and that only a genius could find the correct answer. If 9 = 72, 8 = 56, 7 = 42, 6 = 30, 5 = 20, then 3 = ? In this video I explain what many people believe to be the correct answer. I also show how this answer is logical for other patterns seen in the puzzle.

Update Oct 2022: Everyone is talking about if 9=90, 8=72, then 3= answer puzzle. You can approach it in the same way as this videothe different methods will converge to the same answer with the "missing line" idea.

My blog post on this video (with links to sources)
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