Step-by-step explanation: Well we would know that the original soup is one gallon water and one gallon broth because that is 2 gallons 50% to 50%.
Then to decrease the amount of broth by 10%, we would accomplish this by first turning the original gallons into quarts so we would have 4 quarts broth and 4 quarts water. We need to get a total of ten quarts SO........ we know that we need to add 2 MORE quarts of WATER.
Finally when we add all the quarts together we get 10 total with 6 water and 4 broth which totals to 60% water and 40% broth.
FINAL ANSWER: 2 QUARTS WATER
