Question 953698
To have 37% acetone of 27 oz. leaves 63% water. 0.63*27 oz=17.01 oz water
A 19% solution is 81% water so 17.01/.81=21 oz 
We need 21 oz 0f 19% solution for the water to make 27 oz of 37% solution.
To 21 oz of 19% solution, we add 6 oz acetone to make 27 oz. of 37% solution.