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

### Instruction:
What is the average age of the 1st and 5th fastest dogs if the 1st fastest dog is 10 years old, the 2nd fastest dog is 2 years younger than the first fastest dog, the 3rd fastest dog is 4 years older than the 2nd fastest dog, the 4th fastest dog is half the age of the 3rd fastest dog, and the 5th fastest dog is 20 years older than the 4th fastest dog?

### Response:
 Mbwa wa kwanza ana umri wa miaka 10, na mbwa wa pili ana umri mdogo wa miaka 2 kuliko mbwa wa kwanza, hivyo ana umri wa miaka 10-2=<<10-2=8>>8.
Mbwa wa tatu ana umri wa miaka 4 zaidi ya mbwa wa pili, hivyo ana umri wa miaka 8+4=12.
Mbwa wa nne ana umri wa nusu ya mbwa wa tatu, hivyo ana umri wa miaka 1/2*12=6.
Mbwa wa tano ana umri wa miaka 20 zaidi ya mbwa wa nne, hivyo ana umri wa miaka 6+20=26.
Jumla ya umri wa mbwa wa kwanza na wa tano ni 26+10=<<26+10=36>>36 miaka.
Umri wastani wa mbwa wa kwanza na wa tano ni 36/2=<<36/2=18>>18 miaka.