Vipin is 42 years old and his son is 12 years old.After how many years will Vipin's age be twice thatof his son?

Vipin is 42 years old and his son is 12 years old.After how many years

1.	Vipin is 42 years old and his son is 12 years old.After how many years will Vipin's age be twice thatof his son?
Answer» ANSWER : 18 YEARS