What is the sum of the digits of two-digit positive integer \(M?\)

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What is the sum of the digits of two-digit positive integer \(M?\)

(1) If the digits of \(M\) are reversed, the resulting integer is 27 greater than \(M.\)

(2) The difference between the squares of the digits of \(M\) is 39.

[spoiler]OA=B[/spoiler]

Source: Veritas Prep