SOLUTION: You need a 90% alcohol solution. On hand, you have a 60 mL of a 20% alcohol mixture. You also have 95% alcohol mixture. How much of the 95% mixture will you need to add to obtain t

Question 613567: You need a 90% alcohol solution. On hand, you have a 60 mL of a 20% alcohol mixture. You also have 95% alcohol mixture. How much of the 95% mixture 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 90% alcohol solution. On hand, you have a 60 mL of a 20% alcohol mixture. You also have 95% alcohol mixture. How much of the 95% mixture will you need to add to obtain the desired solution?
.
Let x = amount (mL) of 95% mixture added
then
.95x + .20(60) = .90(x+60)
.95x + 12 = .90x+54
.05x + 12 = 54
.05x = 42
x = 840 mL

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