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Actually there are two logics for this question 11 +12 = 23 where the last digit came to first and the first came to the last. and this logic replies everywhere.that's why 15 +16 = 31 which in inverse gets to be 13. and the second logic is the difference of 20 no.s.

so to ur question there are 2 answers and that are  13 by the fist logic and 112 by the other logic.

112 is the answer

Hope this helps u !!
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112 is the answer ok thanks bolne ki koi zaroorat nahi h
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