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

### Instruction:
Mark is 18 years old. He has a little brother, John, who is 10 years younger. If John and Mark's parents are currently 5 times older than John, how old were they when Mark was born?

### Response:
 John ana umri wa miaka 8 kwa sababu 18 - 10 = <<18-10=8>>8.
Wazazi wao kwa sasa wana umri wa miaka 40 kwa sababu 8 x 5 = <<8*5=40>>40.
Walikuwa na umri wa miaka 22 wakati Mark alipozaliwa kwa sababu 40 - 18 = <<40-18=22>>22.