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

### Instruction:
A choir was singing a song that involved 30 singers. In the first verse, only half of them sang. In the second verse, a third of the remaining singers joined in. How many people joined in the final third verse that the whole choir sang together?

### Response:
 Katika mstari wa kwanza, waimbaji 30 / 2 = <<30/2=15>>15 walikuwa wakiimba.
Katika mstari wa pili, waimbaji 15 / 3 = <<15/3=5>>5 walijiunga.
Katika mstari wa mwisho, waimbaji 30 - 15 - 5 = <<30-15-5=10>>10 walijiunga ili kwaya nzima iweze kuimba pamoja.