Answer :
Summed up: Lauren used 3.6 over 9 weeks. How much did she use per week?
3.6/9 = 0.4 gallons
We're taking the length of time and dividing that into the quantity used to see how much was used each week.
3.6/9 = 0.4 gallons
We're taking the length of time and dividing that into the quantity used to see how much was used each week.