how many milliters of a 2% bleach solution must be mixed with a 20% bleach solution to produce 600 ml of a 5% bleach solution

Question

intermediate algebra

Answer 1

If we use x ml of 2% bleach, then we use (600-x) ml of 20% solution.

 

Looking at the bleach concentrations:

 

.02x + .20(600-x) = .05(600)

Multiply through by 100 to clear the decimals

2x + 20(600-x) = 5(600)

2x + 12000 - 20x = 3000

-18x = 3000 - 12000

-18x = -9000

x = 500 ml of 2% bleach