SOLUTION: You need a 65% alcohol solution. On hand, you have a 525 mL of a 40% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?

Question 613562: You need a 65% alcohol solution. On hand, you have a 525 mL of a 40% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?

Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
You need a 65% alcohol solution. On hand, you have a 525 mL of a 40% alcohol mixture. How much pure alcohol will you need to add to obtain the desired solution?
.
Let x = amount (mL) of pure alcohol added
then
x + .40(525) = .65(x+525)
x + .40(525) = .65(x+525)
x + 210 = .65x+341.25
.25x + 210 = 341.25
.25x = 131.25
x = 525 mL

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