To answer this question you need to figure out how many groups of 2 quarts you can make from a total of 5 gallons. You will need to know the conversion of gallons to quarts. There are 4 quarts in each gallon, so you would have 5 groups (5 gallons) of 4 quarts. 1 gallon = 4 quarts, 2 gallons = 8 quarts, 3 gal = 12 qts, 4 gal = 16 qts, and 5 gal = 20 qts. This can be shown as 5 x 4 = 20 qts. Out of the 20 quarts you can make 10 groups of 2 quarts. This can be show as 20/2. You can fill the canteen 10 times.
