Question

The two digits of a two digit nunber differ by 4.What is the difference between the number and the number formed by reversing its digits?

Answer 1

you have

if we consider the digit x and y

x-y=4(where x is bigger)

the orignal no. is 10x+y and no.reversing by 10y+x

difference is 9(x-y)=9*4=36