SOLUTION: a sterilization tank contains 120 gallons of a solution of 6% bleach mixed with pure distilled water. for complete sterilization, the solution only needs to be at 4%. how much of t

Question 339805: a sterilization tank contains 120 gallons of a solution of 6% bleach mixed with pure distilled water. for complete sterilization, the solution only needs to be at 4%. how much of the solution needs to be drained and replaced with water to reduce the concentration of bleach.
note:: u want to still have 120 gallons of solution when you are finished diluting.
Found 2 solutions by stanbon, mananth:
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
a sterilization tank contains 120 gallons of a solution of 6% bleach mixed with pure distilled water. for complete sterilization, the solution only needs to be at 4%. how much of the solution needs to be drained and replaced with water to reduce the concentration of bleach.
note:: u want to still have 120 gallons of solution when you are finished diluting.
-----------------------
Equation:
bleach - bleach + bleach = bleach
0.06*120 - 0.06x + 0x = 0.04*120
---
Multiply thru by 100 to get:
6*120 - 6x + 0 = 4*120
6x = 2*120
x = 40 gallons (amt. of 6% solution that must be replaced by water)
==========================
Cheers,
Stan H.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
sterilization tank contains 120 gallons of a solution of 6% bleach
mixed with pure distilled water.
needs to be at 4%.
..
let water required be x 0%
120-x gallons 6%
Mix 120 gallons 4%
...
0+0.06(120-x)=120*0.04
7.20-0.06x=4.80
7.20-4.80 = 0.06x
2.4 = 0.06x
x=40 liters
RELATED QUESTIONS
The sterilization tank contains 100 gallons of a solution of 2% ordinary household... (answered by Theo)
The sterilization tank contains 100 gallons of a solution of 2% ordinary household bleach (answered by Greenfinch)
A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are (answered by stanbon,josmiceli)
A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are (answered by richwmiller)
Can you help me with this equation problem? A health clinic uses a solution of bleach... (answered by ankor@dixie-net.com)
A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are (answered by Paul)
a health clinic uses a solution of bleach to sterilize petri dishes in which cultures are (answered by stanbon)
A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are (answered by ankor@dixie-net.com)
A health clinic uses a solution of bleach to sterilize petri dishes in which cultures are (answered by stanbon)