The unit digits of each of two natural numbers XandYwhen expresses in base n is a. If the unit digits of X+Y/2 is 2 or 5 in base n,find n.(i could not understand the given explanation ' inside iim)

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The unit digits of each of two natural numbers XandYwhen expresses in base n is a. If the unit digits of X+Y/2 is 2 or 5 in base n,find n.(i could not understand the given explanation ' inside iim)