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

### Instruction:
Eden's mom is twice as old as Eden, who is twice as old as Devin. If Devin is 12 years old, what's the average age of the three?

### Response:
 Kwa kuwa Eden ni mara mbili zaidi ya umri wa Devin, yeye ana miaka 12 * 2 = <<12*2=24>>24.
Mama wa Eden ni mara mbili zaidi ya Eden, ambayo inamaanisha ana miaka 24 * 2 = <<24*2=48>>48.
Jumla ya umri wa watatu hao ni 24 + 48 + 12 = <<24+48+12=84>>84.
Umri wa wastani kwa watatu hao ni 84 / 3 = <<84/3=28>>28.