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?

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