What is the mass percent of a solution prepared by dissolving 18.9 g of solid into 39.5 g of water

1,000 grams = 1 kilogram 2,000 grams = 2 kilograms 3,000 grams = 3 kilograms . . . 6,000 grams = 6 kilograms 7,000 grams = 7 kilograms (That's more than 6 kilograms.)