Question: I need help with this problem:
Liam is 16 years old now. Two years ago, Liam’s age was twice the age of Vince. How old is Vince now?
Answer: 
Liam's age two years ago was 16 - 2 = 14 years old.
Vince's age two years ago was 14/2 = 7 years old because Liam's age is twice his.
So Vince age now is 7 + 2 = 9 years old.