Question

The difference between 2 digit no and the no obtained by interchanging the digit is 18 find original no if the ratio between the digit of a number are in ratio 3:5

Answer 1

here, xy-yx=18

10x+1y-10y-1x=18

9x-9y=18

9(x-y) =18

x-y =18/9=2

3x-5x=2

-2x=2

x=-1

first=-3

second =-5