Question

Marks brother is five years older than Mark. Their combined ages add up to 23. How old is Mark?

Answer 1

18

Explanation:

equation: 5 + a(unknown age) = 23

23 - 5 = 18,

5 + 18 = 23

Therefore Mark is 18 years old

Answer 2

Mark is 9 (and his brother is 14).