The number obtained by interchanging the two digits of a two digit number is lesser than the original number by 54. If the sum of the two digits of the number is 12, then what is the original number?
None of these
Let the number be xy
(10x+y)-(10y+x)=54
x-y=6 And x+y=12
Solving the equations we get x=9 and y=3
So the number is 93.