Brain Bending Logic Math Puzzle With Missing Number

This is a brain-bending logic math question that will make you think outside the box. In this logic math puzzle, you are shown some number equations. Your challenge is to find the logical relationship in these number equations. Once you can decipher the logical reasoning hidden in these equations, find the value of the missing number that replaces the question mark.


IF 81 + 9 = 9, 61 + 8 = 8 and 21 + 4 = 8 THEN 51 + 9 = ?
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