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

### Instruction:
Janet uses her horses' manure as fertilizer. One horse produces 5 gallons of fertilizer per day. Once Janet has collected enough fertilizer, she'll spread it over 20 acres of farmland. Each acre needs 400 gallons of fertilizer and Janet can spread fertilizer over 4 acres per day. If Janet has 80 horses, how long will it take until all her fields are fertilized?

### Response:
 Janet anaweza kuzalisha galoni 80 x 5 = <<80*5=400>>400 za mbolea kwa siku.
Kwa kuwa Janet anaweza kusambaza mbolea juu ya ekari 4 kwa siku, kila ekari inahitaji galoni 400/4 = <<400/4=100>>100 za mbolea.
Kwa kuwa kila ekari inahitaji galoni 400 za mbolea, ekari 20 zinahitaji galoni 20 x 400 = <<20*400=8000>>8000 za mbolea.
Kwa kuwa Janet anaweza kuzalisha galoni 400 za mbolea kwa siku, itachukua siku 8000/400 = <<8000/400=20>>20 hadi mashamba yake yote yapewe mbolea.