In four years, Suzy will be twice Mary's age then. If Suzy is 20 now, how old is Mary? Let's think first. Chain of thought:
User
In four years, Suzy will be 20 + 4 = 24. Then Mary will be 24 / 2 = 12. Then Mary is now 12 - 4 = 8.
Therefore, the answer is 8.
Assistant