Answer:
Decreased by 2 gallons per day
Step-by-step explanation:
We can clearly see that , on 1st day it was 12 gallons and then on 2nd day it decreased by 2 gallons and becomes 10 gallon , and this cycle continues by decreasing of 2 gallons per day.
From 14 to 12 then 10 ..... and at last 4 gallons
