In four years, Suzy will be 20+4=<<20+4=24>>24.

Then Mary will be 24/2=<<24/2=12>>12.

Then Mary is now 12-4=<<12-4=8>>8.

# Answer

8
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
In four years, Suzy will be twice Mary's age then. If Suzy is 20 now, how old is Mary?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
8
In four years, Suzy will be twice Mary's age then. If Suzy is 20 now, how old is Mary?
train