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?
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.
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