PROBLEM 2 a) Chicago has a population of about 2,700,000 residents. The American Dental Association recommends brushing your teeth for 2 minutes each day, twice per day. If every resident followed this recommendation, how many gallons of water could the city save in just one day? Be sure to explain your thinking and show your calculations. b) How much water could the city save in a year? c) Try putting this amount of water into perspective and find something that holds close to that amount of water. (Hint: Probably not your backyard pool.)