Answer:
9 7/8 gallons of water.
Explanation:
When you convert both mixed numbers into improper fractions with the same denominator, you can add the two fractions
5 3/8 as an improper fraction is 43/8, and 4 1/2 becomes 9/2. Multiply 9/2 by 4 to get the same denominators for both fractions.
43/8 + 36/8 = 79/8
79/8 as an improper fraction is 9 7/8.