Question 477899
Solution A is 20% acid.  Find the amount of Solution A and the amount of pure water needed to make 5 liters of a new solution that is 18% acid.
.
Let x = amount (liters) of 20% acid
then
5-x = amount (liters) of water
.
.20x +0(5-x) = .18(5)
.20x = .18(5)
.20x = .9
x = 4.5 liters of 20% acid
.
Amount of pure water:
5-x = 5-4.5 = .5 liters of pure water