Question

Two digit-

Answer 1

Let the number = 10x+y

x+y = 9

y-x = 1

(x+y)+(y-x) = 9+1

2y = 10

y = 10/2

y = 5

x+y = 9

9-y = x

x = 9 - 5

x = 4

So, your number is 45

... Hope this will help...