**C. 1343.** At present, a father is five years older than the total age of his three sons. In ten, twenty, and thirty years, the father's age will be twice the age of his first, second and third son, respectively. How old is the father now, and how old are his sons?

(*Matlap*)

(5 points)

This problem is for grade 1 - 10 students only.

**Deadline expired on 11 April 2016.**