Below is an instruction that describes a task. Write a response that appropriately completes the request in English. Please answer in English.

### Instruction:
Harper has 15 rubber bands. His brother has 6 fewer rubber bands than he has. How many rubber bands do they have together?

### Response:
His brother has 15 rubber bands - 6 rubber bands = <<15-6=9>>9 rubber bands.
They have 15 rubber bands + 9 rubber bands = <<15+9=24>>24 rubber bands together.
#### 24