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

### Instruction:
 Kevin anarekebisha simu kazini. Mwanzoni mwa siku, Kevin ana simu 15 ambazo zinahitaji kurekebishwa. Kufikia mchana, Kevin amefanikiwa kurekebisha simu 3 kati ya simu 15 na mteja ameleta simu 6 zaidi ambazo zinahitaji kurekebishwa. Ikiwa mfanyakazi mwenzake Kevin anatoa msaada na kurekebisha nusu ya simu zilizoharibika, kila mtu atahitaji kurekebisha simu ngapi?


### Response:
 Kevin anaanza siku na simu 15 na anarekebisha 3 kufikia mchana, hivyo Kevin bado anahitaji kurekebisha simu 15 - 3 = <<15-3=12>>12.
Mteja analeta simu 6 zaidi ambazo zinahitaji kurekebishwa, hivyo jumla ni 12 + 6 = 18 simu.
Ikiwa mfanyakazi mwenzake Kevin anamsaidia kurekebisha nusu ya simu, basi wote wawili watatakiwa kurekebisha 18 simu / 2 = <<18/2=9>>9 simu kila mmoja.