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

### Instruction:
Isaac cut his 30 meters ribbon into 6 equal parts. He then used 4 parts of the ribbon. How many meters of ribbon are not used?

### 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.