A5-gallon jug of cleaning solution contains 6% bleach. how much pure water should be added to it to dilute to 4% bleach? a. 1/4 gallon of waterb. 2.5 gallons of waterc. 2 gallons of waterd. none of these

Let's bear in mind that 5 gallons with a solution of 6% bleach, contains some water plus some bleach, how much bleach?  well, is just 6% of 5 gallons or namely (6/100) * 5 gallons, or 0.30 gallons.

if we use "x" gallons of water, well pure water has no bleach, so is 0% bleach, and it has a (0/100) * x or 0x gallons of bleach.

the mixture will be say "y" gallons, and is 4% bleach, so (4/100) * y is 0.04y gallons in the mixture of bleach.