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

### Instruction:
 Harper ana mihimili 15 ya mpira. Ndugu yake ana mihimili 6 chini ya ile ya Harper. Wana mihimili mingapi ya mpira pamoja?


### Response:
 Ndugu yake ana mihimili 15 ya mpira - 6 mihimili = 9 ya mpira.
Wana mihimili 15 ya mpira + 9 ya mpira = <<15+9=24>>24 ya mpira pamoja.