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

### Instruction:
 Maiya ana dada wawili. Dada wa kwanza ni mara mbili umri wa Maiya. Dada wa kwanza ni mwaka mmoja mdogo kuliko Maiya. Umri wao wa wastani ni miaka 5. Maiya ana umri gani?


### Response:
 Jumla ya umri wao ni 15 kwa sababu 3 x 5 = <<3*5=15>>15
15 - X - 2X -(X-1) ni sawa na 16=15
X=16/4
X = 4 miaka