SOLUTION: How much water should be mixed with an 8% plant fertilizer solution to make a half gal of a 6% plant fertilizer solution?

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Question 991009: How much water should be mixed with an 8% plant fertilizer solution to make a half gal of a 6% plant fertilizer solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The water is 0% fertilizer and only adds mass to the mixture, but adds no fertilizer to the mixture.

HOW MUCH OF 8% fertilizer and HOW MUCH WATER?
v, how much fertilizer from the 8%
1/2-v, how much water

8v%2F%281%2F2%29=6
You already know that you want half gallon of mixture, shown as the denominator.

16v=6
v=6%2F16
highlight%28v=3%2F8%29------the amount of the 8% fertilizer.

highlight%285%2F8%29------gallons of water.