I want left an empty 3 gallon bucket outside it rain for several days when he check the bucket have been filled with 5 quarts of water how many more quarts of water can still fit

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.