SOLUTION: How much water should be added to 4 gallons of a 5% herbicide solution to dilute it to a 3.2% herbicide solution? whats the answer?

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Question 905904: How much water should be added to 4 gallons of a 5% herbicide solution to dilute it to a 3.2% herbicide solution? whats the answer?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
water = water
x the water added
.95(4G) + x = .968(4G + x)
x = .018/.032