###Human: Emma is 7 years old.  If her sister is 9 years older than her, how old will Emma be when her sister is 56?, ### Assistant: Emma’s sister is 7 + 9 = 16 years old.
In this many years, Emma’s sister will be 56 years old: 56 - 16 = 40 years.
When her sister is 56 years old, Emma will be 7 + 40 = 47 years. 
 So the answer is :  47