A water tank decreases by 10 gallons every 3 hours every day. What is the total change in the amount of water in the tank after 6 days?

Question

A. -80 gallons
B. -480 gallons
C. 480 gallons
D. 80 gallons

Answer 1

The water tank decreases by 10 gallons every 3 hours, so it decreases by 10/3 = <<10/3=3.3333333333333335>>3.33 gallons every hour.
In one day, which has 24 hours, the water tank decreases by 24*3.33 = <<24*3.33=79.92>>79.92 gallons.
So after six days, the water tank will decrease by 6*79.92 = 479.52 gallons.
The total change in the amount of water in the tank after 6 days is -479.52 gallons, which is approximately equal to -480 gallons.
Therefore, the correct answer is B. -480 gallons.