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

### Instruction:
 Umri wa Grace ni 3/8 ya umri wa bibi yake. Bibi yake ni mara mbili ya umri wa mama yake Grace. Ikiwa mama yake Grace ana umri wa miaka 80, Grace ana umri gani?


### Response:
 Bibi yake Grace ana umri wa miaka 2 * 80 = <<2*80=160>>160.
Umri wa Grace ni 3/8 * 160 = <<3/8*160=60>>60 miaka.