Question

I am a 3 digit odd umber. my tens digit is one less than my hundreds digit but two more than my ones digit. The sum of my digits is 20. who am I?

Answer 1

let the unit digit be x
tens digit is x+2
hundreds digit is x+3

x+3 + x+2 + x = 20
3x = 15
x = 5

number is 875

Answer 2

Let x = tens digit, the x + 1 = hundreds and x - 2 = ones

3x - 1 = 20

3x = 21

x = 7

x + 1 = ?

x -2 = ?