SOLUTION: How much water must be added to 120 mL of a 35% alcohol solution to dilute it to a 25% alcohol solution?

Question 866354: How much water must be added to 120 mL of a 35% alcohol solution to dilute it to a 25% alcohol solution?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
--- percent ---------------- Amount
Alcohol I 35 ---------------- 120 ml
water 0 ---------------- x ml
Mixture 25 ---------------- 120 + x ml

35 * 120 + 0 x = 25 ( 120 + x )
4200 + 0 x = 3000 + 25 x
0 x -25 x = -4200 + 3000
-25 x = -1200
/ -25
x = 48 ml water

m.ananth@hotmail.ca

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