A water tank decreases by 10 guns every three hours every day. What is the total change the amount of water in the tank after six days?

Since the tank decreases by 10 grams every 3 hours, it decreases by 10/3 = <<10/3=3.3333333333333335>>3.33 grams every hour.

So, it decreases by 24 x 3.33 = <<24*3.33=79.92>>79.92 grams every day.
Therefore, it decreases by 79.92 x 6 = <<79.92*6=479.52>>479.52 grams after six days. Answer: \boxed{479.52}.

To find the total change in the amount of water in the tank after six days, we need to calculate the change in the amount of water for each day and then sum them up.

Given that the water tank decreases by 10 guns every three hours, we can calculate the change in the amount of water for each day as follows:

Change in the amount of water for one day = (number of 3-hour periods in a day) * (decrease per 3-hour period)
= (24 hours / 3 hours) * 10 guns
= 8 * 10 guns
= 80 guns

Therefore, the change in the amount of water for each day is 80 guns.

To find the total change in the amount of water after six days, we multiply the change per day by the number of days:

Total change in the amount of water after six days = change per day * number of days
= 80 guns/day * 6 days
= 480 guns

Therefore, the total change in the amount of water in the tank after six days is 480 guns.

To find the total change in the amount of water in the tank after six days, we need to determine the change per day and then multiply it by the number of days.

We are given that the tank decreases by 10 gallons every 3 hours. Since there are 24 hours in a day, we can convert this rate to gallons per day by calculating the decrease per hour and then multiplying it by 24.

The decrease per hour is 10 gallons, so the decrease per day is (10 gallons / 3 hours) * 24 hours = 80 gallons.

Now, we can calculate the total change in the amount of water after six days by multiplying the decrease per day by the number of days:

Total change = 80 gallons/day * 6 days = 480 gallons.

Therefore, the total change in the amount of water in the tank after six days is 480 gallons.