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?
He needs 12.5 gallons per day because 25 x .5 = <<25*.5=12.5>>12.5
It will take 20 days of travel because 4,000 / 200 = <<4000/200=20>>20
He will need 250 gallons of water because 20 x 12.5 = <<20*12.5=250>>250
#### 250