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

### Instruction:
In eight years, Mr. Bernard will be 3 times as old as Luke is now. If Luke is 20, what is 10 years less than their average age?

### Response:
 Baada ya miaka nane, Bwana Bernardi atakuwa na umri wa 20 x 3 = <<20*3=60>>60 miaka.
Bwana Bernardi kwa sasa ana umri wa 60 - 8 = <<60-8=52>>52 miaka.
Hivyo, Luke ana umri wa 52/20 = <<52/20=2.6>>2.6 mara mdogo kuliko Bwana Bernardi.
Hii inamaanisha, Luke ana umri wa 52/2.6 = <<52/2.6=20>>20 miaka kwa sasa.
Jumla ya umri wao ni 52 + 20 = <<52+20=72>>72 miaka.
Wastani wa umri wao ni 72/2 = <<72/2=36>>36 miaka.
Miaka 10 chini ya wastani wao wa umri ni 36 - 10 = <<36-10=26>>26 miaka.