Question

the digits of a two digit number differ by 7 if digits are interchanged and resulting number is added to the orignal number we get 121 find the orignal number

Answer 1

We know that the last two digits equal 11 because the last digit of 121 is 1. That means it can be from the following: 29, 38, 47, 56. From here we get 29 because the difference is 7.

Answer 2

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