SOLUTION: Rubbing alcohol is typically diluted with water to 70% strength. If you need 3.5 oz of 55% rubbing alcohol, how many ounces of 70% rubbing alcohol and how much water should you com

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Question 913836: Rubbing alcohol is typically diluted with water to 70% strength. If you need 3.5 oz of 55% rubbing alcohol, how many ounces of 70% rubbing alcohol and how much water should you combine?
I know Ar=Q but can't seem to quite figure out how to apply it to find the solution....

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
water = water
x the amount of water added
x + .30(3.5oz - x) = .45(3.5oz)
x = .15(3.5oz) /.70 = .75oz, the amount of water to add
2.75oz of the 70% solution
....
Checking
1.575 = 1.575