Question

If we substract 4 from units place and add 4 for tens place of a two digit number, the number becomes twice the first number find the number

Answer 1

Let say ‘x' is digit on one's place so 3x is digit on tens' place

So number is 10*3x+x=31x

Now if reverse the possition of digit new number is

10*x+3x=13x

As given new number is less by 36 from old number

31x-36=13x

18x=36

x=2

So number is 10*3*2+2=62.