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

### Instruction:
Olaf is sailing across the ocean with 25 men, including himself. He needs 1/2 a gallon of water per day per man. The boat can go 200 miles per day and he needs to travel 4,000 miles. How many gallons of water does he need?

### Response:
 Watasafiri kwa siku 4000/200=<<4000/200=20>>20
Anahitaji nusu galoni kwa siku kwa kila mtu * watu 25 = <<1/2*25=12.5>>12.5 galoni kwa siku
Jumla anahitaji galoni 12.5 kwa siku * siku 20 = <<12.5*20=250>>250 galoni