SOLUTION: In a chemistry class, 4 liters of a 4% silve iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?

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Question 567631: In a chemistry class, 4 liters of a 4% silve iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution are needed?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
In a chemistry class, 4 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution.
How many liters of the 10% solution are needed?
:
Let x = amt of 10% solution required
:
.04(4) + .10x = .06(x+4)
.16 + .10x = .06x + .24
.10x - .06x = .24 - .16
.04x = .08
x = .08/.04
x = 2 liters of 10% solution needed
;
:
Check this
.04(4) + .10(2) = .06(2 + 4)
.16 + .20 = .06(6)
.36 = .36; confirms our solution