###Human: Roger's age is 5 more than twice Jill's age. In 15 years, their age difference will be 30 years less than Finley's age. If Jill is 20 years old now, how old is Finley?, ### Assistant: Twice Jill's age is 2*20=40
If Roger's age is 5 more than twice Jill's age, he is 5+40=45 years old.
In 15 years, Jill will be 20+15=35 years old.
Roger's age will be 45+15=60 years old in 15 years.
The age difference between Roger and Jill in fifteen years will be 60-35=25 years
In 15 years, the age difference between Roger and Jill will be 30 years less than Finley's age, meaning in fifteen years Finley will be 30+25=55 years old.
Currently, Finley is 55-15=40 years old. 
 So the answer is :  40