How do I simplify (7w)2

Janet is mixing a 15% glucose solution with a 35% glucose solution. this mixture produces 35 liters of a 19% glucose solution. how many liters of the 15% solution is januet using in the mixture? a. 25 liters c. 28 liters b. 7 liters d. 10 liters

What properties allow transformation to be used as a problem solving tool

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?