Answer: 10,800,000 gallons
Step-by-step explanation:
Water usage per day per person=2 gallons×2 brushing sessions=4 gallons
Total water usage per day for all residents
=
4
gallons/person/day
×
2
,
700
,
000
residents
Total water usage per day for all residents=4 gallons/person/day×2,700,000 residents
=
10
,
800
,
000
gallons
=10,800,000 gallons
So, if every resident in Chicago followed the recommendation to brush their teeth for 2 minutes twice a day, the city could save approximately 10,800,000 gallons of water in just one day.
