Pheneg-xu drinks 1 cup of milk every day. how many gallons does he drink each week.

Let x = number of cups drank per week
let y = number of gallons drank per week

x = 1 cup x 7 days
x = 7 cups per one week

y = 7 cups per week x 0.0625 gallons
y = 0.4375 liquid gallons each week

Therefore Pheneg-Xu drinks 0.4375 liquid gallons each week