How many liters of water should be added to 18 liters of a 14% bleach solution so that the remaining solution contains only 10% bleach?
:
Let w = amt of water required to make a 10% solution
:
.14(18) = .10(w+18)
2.52 = .1w + 1.8
2.52 - 1.8 = .1w
.72 = .1w
multiply both sides by 10
7.2 = w
:
7.2 liters of water added