Emily is 20 years old and her older sister, Rachel, is 24 years old.  How old is Rachel when Emily is half her age? Let's think step by step and output the final answer after "####".
user
The difference in age between the two sisters is 24 - 20 = <<24-20=4>>4 years.
When Rachel is twice Emily’s age, she is 4 x 2 = <<2*4=8>>8 years old.
#### 8
Emily is 20 years old and her older sister, Rachel, is 24 years old.  How old is Rachel when Emily is half her age?
train