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

### Instruction:
 Isaac alikata mkanda wake wa mita 30 katika sehemu 6 sawa. Kisha akatumia sehemu 4 za mkanda. Mita ngapi za mkanda hazikutumiwa?


### Response:
 Kila sehemu ni mita 30/6 = <<30/6=5>>5.
Kwa kuwa Isaac alitumia sehemu 4, basi alitumia mita 5 x 4 = <<4*5=20>>20 za mkanda.
Hivyo, mita 30 - 20 = <<30-20=10>>10 za mkanda hazikutumiwa.