Answer:
Carol drank 0.5625 gallon of water in one day.
Step-by-step explanation:
Carter drink 15.75 gallons of water in 4 weeks. Each week consists of 7 days, then there are [tex]4\cdot 7=28[/tex] days in for weeks.
If he drank the same amount of water each day, then he drank in one day
[tex]15.75:28=0.5625[/tex] gallon of water.