How much bleach in 1 gallon water to make 5 percent solution?

Answer 1

let x=the amount of bleach, and y=the total amount of liquid.

then we know:1) 1+x=y and 2) x/y=0.05

so x=0.05y (rearranging 2)

sub into 1 to get: 1+0.05y=y

1=0.95y

y=1/0.95=1.053 gallons (correct to 3dp)

so x=the amount of bleach to use=0.053 gallons (correct to 3dp)