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

### Instruction:
Jessica was half her mother's age when her mother died. If her mother were alive now, ten years later, she would have been 70. How old is Jessica currently?

### Response:
If Jessica's mother would be alive today, ten years later after her death, she would be 70, meaning she died at 70-10=<<60=60>>60.
If Jessica was half her mother's age when her mother died, she was 1/2*60=30 years old.
Currently, ten years later, Jessica is 10+30=<<10+30=40>>40 years old.
#### 40