Question 585600
Let dinos' age be x  five years ago
father's age = 5x  

After 13 years

dino's age = x+18 
Father's age = 5x+18

2(x+18)= 5x+18

2x+36= 5x+18

5x-2x= 36-18
3x=18
/3
x= 6 years  5 years ago.

Now Dino's age = 5+5 = 10 years
Father's age 5 years ago = 5x= 30 years

Now Father's age = 35 years