Question

the difference between a two digit number and the number obtained by interchanging the position of digits is 18. what is the difference between the digits of the number ?

Answer 1

9 is the correct Nsw

Answer 2

let a, b are digits of number
$(10a + b) - (10b + a) = 18 \\ 9a - 9b = 18 \\ a - b = 2$