Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Emily is 20 years old and her older sister, Rachel, is 24 years old.  How old is Rachel when Emily is half her age?

### Response:
Emily is 20 and Rachel is 24 years old.
If Emily is half of Rachel's age, then Emily is 24/2 = <<24/2=12>>12 years old.
Rachel will be 24 + 12 = <<24+12=36>>36 years old when Emily is 12 years old.
#### 36

