Question

The sum of Richard's age and his older brother's age is 63. The difference between their ages is thirteen. How old are Richard and his brother?

Answer 1

Denote Richard's age as X years, therefore his older brother age would be X + 13 years.
Thus
X + X +13 = 63
2X = 50
X = 25
X + 13 = 38
Answer: Richard is 25 years old, his older brother is 38 years old.