OK. SO first you need to know how many pints are in a gallon. ( one gallon = 8 quarts )
One day = one pint. So we want to find what 366 days equals. 1*366=366 pints in 366 days. We now have 366 pints. We need to convert that to gallons. One gallon equals 8 quarts, so we divide 366 by 8. 366/8= 45.75
So in one leap year a person drinks 45.75 gallons of milk
If that doesn't make sense, ask and i can re explain. Hope that helped!