Question

The sum of the digits of a two number is 12,and the difference between the number and that formed by reversing the digits is 36. find out numbers.

Answer 1

let us say the number is AB
Its value is 10A + B

Given A+B = 12  --- equation 1

     AB - BA = 36  that means  10A+B - (10B+A) = 36
     9 A - 9 B = 36             
     A - B = 4              equation 2

Now add equation 1 and equation 2

2 A +B - B = 12+4 = 16

So A = 8                Using equation1, we find B = 4

Given number is 84 and reverse number is 48