In four years, Suzy will be twice Mary's age then. If Suzy is 20 now, how old is Mary? Let's think step by step and output the final answer after "####".
user
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.
#### 8
In four years, Suzy will be twice Mary's age then. If Suzy is 20 now, how old is Mary?
train