How many liters of water should be added to 18 liters of a 14% bleach solution so that the resulting solution contains only 10% bleach? Original (L)Added (L)New (L)Amount of Bleach2.520 Amount of Solution18x

The original solution contains 18 × 0.14 = 2.52 liters of bleach. Adding water does not change the amount of bleach, so for a 10% solution the total volume must be 2.52 ÷ 0.10 = 25.2 liters. Subtract the original 18 liters: 25.2 − 18 = 7.2 liters of water, which is choice B.

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