Ruben is 5 years older than Sarah she is x years old. A year ago Ruben was 30. How old is Sarah?

Since ruben was 30 years old last year, this year he is 31 years old. Ruben is 5 years older that Sarah so 31-x=5. Solving this equation gets Sarah is 26 years old right now.

Ruben has to be 31 years old since she was 30 last year.

31-5 = 26.

Sarah is 26 years old.

~~Hypotenuisance