Question

The sum of Tony's age and his older brother's age is 29. The difference between their ages is 5 years. How old is Tony?

Answer 1

First thing you need to do is represent values... do you use systems here?

Answer 2

Tony = x
Tony's elder brother = x + 5 ( You know it's + since he's older )

x + (x+5) = 29

2x = 29-5
2x = 24
x = 12