Eleven plus two equals Nine

If eleven plus two equals one, what does nine plus five equal?




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3 / 9 = 7
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Then

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An inspection by the superintendent of St. Joseph School was scheduled on the next day. The class teacher Jenifer knew that he would be asking questions from her class and she would have to choose a pupil to answer. To offer a perfect impression over him, the teacher explained certain instructions to the students to maximise the chances of getting correct answer every time.

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Oedipus, the king of Thebes, figured out the answer to the riddle:

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