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            Jokes and Riddles
            Math and Arithmetic
            Algebra

            When does 9 plus 4 equal 1?

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            Wiki User
            July 14, 2012 11:30PM

            9 a.m + 4 hours = 1 p.m.

            More generally, when you are doing modulus arithmetic, specifically mod 12.

            ie.

            (9+4) mod 12 = 1

            not as tough as 9 pm + 4 hours = 1 am