Let us consider a two digit number. If the digits are interchanged, the new number is 9 more than the original number. The second digit of the original number is one more than the first digit. Find the number.(adsbygoogle = window.adsbygoogle || []).push({});

Let x be the first digit and y be the second digit

(10y + x) - (10x +y) = 9

and

y -x =1

(10y + x) - (10x +y) = 9

9y -9x = 9

y - x = 1

I find out that both equations are the same does that mean that there isn't enough information or have I done something wrong?

From messing around I find the number is 12

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