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

### Instruction:
 John anakwea ngazi 3. Kila ngazi ina urefu wa futi 10. Kisha anakwea kamba ambayo ni nusu ya urefu huo. Hatimaye, anakwea ngazi ambayo ni ndefu kwa futi 10 kuliko kamba. Alikwea urefu gani?


### Response:
 Alikwea futi 3*10=<<3*10=30>>30 za ngazi.
Kisha alikwea futi 30/2=<<30/2=15>>15 za kamba.
Hatimaye, alikwea ngazi ya futi 15+10=<<15+10=25>>25.
Jumla ya urefu aliokwea ni futi 30+15+25=<<30+15+25=70>>70.