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

### Instruction:
Trevor is currently 11 years old and his older brother is 20 years old. How old will Trevor be when his older brother is three times as old as Trevor is now?

### Response:
 Wakati Trevor ana miaka 11, kaka yake mkubwa atakuwa na miaka 11 x 3 = <<11*3=33>>33.
Kaka yake mkubwa wa Trevor ni miaka 9 zaidi ya Trevor.
Kwa kuwa Trevor ni miaka 9 mdogo, Trevor atakuwa na miaka 33 - 9 = 24.