Ahealth clinic uses a solution of bleach to sterilize petri dishes in which cultures are grown. the sterilization tank contains 60 gal of a solution of 4% ordinary household bleach mixed with pure distilled water. new research indicates that the concentration of bleach should be 6% for complete sterilization. how much of the solution should be drained and replaced with bleach to increase the bleach content to the recommended level? 4.5425 x gal need ? read it talk to a tutor page 1 of 1 0 words english (us) e e. ' - - - + 288%

1.25 gal

Step-by-step explanation:

4% of 60 equals 2.4, that means the tank contains 2.4 gal of pure bleach.  

You want the tank to contain 3.6 gal of pure bleach because 6% of 60 equals 3.6.

Now suppose you drain x gallons of solution, so now you 60-x gal in the tank.

In order to know how much bleach the tank has now, cross multiply

60 gall --------------> 2.4 gal pure bleach

60-x ------------------> ?

so

Now, you want to add x gal of pure bleach to complete the solution extracted in such a way that the amount of pure bleach in the tank is now 3.6, so we get the linear equation

Multiply both sides by 60 to eliminate the denominator