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

### Instruction:
John weighs one-quarter times more than what Mary weighs. Mary weighs 20 lbs less than Jamison's weight. If Mary weighs 160 lbs, what's the combined weight of the three?

### Response:
 Kwa kuwa John anapima robo moja zaidi ya uzito wa Mary, anapima 1/4 * pauni 160 = pauni 40 zaidi.
Uzito wa pamoja wa John ni pauni 160 + pauni 40 = <<160+40=200>>200.
Ikiwa Mary anapima pauni 20 chini ya uzito wa Jamison, Jamison anapima pauni 160 + pauni 20 = <<160+20=180>>180.
Uzito wa pamoja wa watatu hao ni pauni 180 + pauni 200 + pauni 160 = <<180+200+160=540>>540.