The sum of the digits of a two-digit number is 9. If 27 is added to it, the digits of the number get reversed. The number is
27
72
63
36
X+y=9
10x+y+27=x+10y
Then
9x-9y=-27
Solving this will get x=3 and y=6
Sum of digits of a two digit number is 9.If 27 is added to the number,the digits of the original number get interchanged.Find the original number.