SOLUTION: Becky makes an antiseptic of alcohol and water. If she buys a solution that is 40% alcohol to make a 12.5% alcohol solution, how much water and alcohol solution should she mix to o

Question 1008630: Becky makes an antiseptic of alcohol and water. If she buys a solution that is 40% alcohol to make a 12.5% alcohol solution, how much water and alcohol solution should she mix to obtain 128 mL of her homemade antiseptic?
Answer by jorel555(1290) (Show Source): You can put this solution on YOUR website!
Let n be the amount of 40% alcohol solution needed.
128ml * 12.5%=16 ml of alcohol
.4n=16
n=16/.4=40 ml of 40% solution mixed with 88 ml of water gives you 128 mL of 12.5% solution!!!!!!
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