The father is two times as old as his son. Twelve years before the father was tree times the sins age, how old is the son

Question

The father is 2 tikes as old as his son, twlve years before the father was 3 times the sons age, how old is the son ?

Answer 1

Let S=son's age. Father's age=2S. Father's age 12 years ago=2S-12=3(S-12), 3 times the son's age 12 years ago.

2S-12=3S-36, 24=S, so son is 24 years old.