human
Trevor is currently 11 years old and his older brother is 20 years old. How old will Trevor be when his older brother is three times as old as Trevor is now?
assistant
How old will Trevor's older brother be when Trevor is 11? ** When Trevor is 11, his older brother will be 11 x 3 = <<11*3=33>>33 years old.
How old is Trevor's older brother? ** Trevor’s older brother is 20 - 11 = <<20-11=9>>9 years older than Trevor.
How old will Trevor be when his older brother is 33? ** Since Trevor is 9 years younger, Trevor will be 33 - 9 = <<33-9=24>>24 years old.
#### 24