SOLUTION: A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are grown. The sterilization tank contains 120 gal of a solution of 4% ordinary household blea
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Question 903816: A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are grown. The sterilization tank contains 120 gal of a solution of 4% ordinary household bleach mixed with pure distilled water. New research indicates that the concentration of bleach should be 5% for complete sterilization. How much of the solution should be drained and replaced with bleach to increase the bleach content to the recommended level? Answer by richwmiller(17219) (Show Source):
You can put this solution on YOUR website! 0.04*120-0.04x+1x=0.05(120)
4.8+0.96x=6
0.96x=6-4.8
0.96x=1.2
x=1.25 gal
check
0.04*118.75+1*1.25=0.05(120)
4.75+1.25=6
6.0=6
ok
