human
Harper has 15 rubber bands. His brother has 6 fewer rubber bands than he has. How many rubber bands do they have together?
assistant
How many rubber bands does his brother have? ** His brother has 15 rubber bands - 6 rubber bands = <<15-6=9>>9 rubber bands.
How many rubber bands do they have together? ** They have 15 rubber bands + 9 rubber bands = <<15+9=24>>24 rubber bands together.
#### 24