2 and 1/4 quarts of grape juice. It's simple.... see how he made nine batches? take 4 out of 9 and you have an quart. Then take another 4 out of 9 and you have 2 quarts. Then with the one left over, it's 1/4 of a quart. So add all of that together and you have 2 1/4 quarts! Hope this helps.
