SOLUTION: A nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add?

Question 114741: A nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A nurse wants to add water to 30 ounces of a 10% solution of benzalkonium chloride to dilute it to an 8% solution. How much water must she add?
:
Let x = amt of water required
:
.10(30) = .08(x+30)
;
3 = .08x + 2.4
:
.08x = 3 - 2.4
:
.08x = .6
:
x = .6/.08
:
x = 7.5 oz of water required
:
:
Check answer to see if the amt of "that stuff", is the same in both solutions
.1(30) = .08(30 + 7.5)
.1(30) = .08(37.5)
3 = 3
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