SOLUTION: How much water should be mixed with a 10% plant fertilizer solution to make a half gallon of a 4% plant fertilizer solution

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Question 1190311: How much water should be mixed with a 10% plant fertilizer solution to make a half gallon of a 4% plant fertilizer solution
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
"10% plant fertilizer" ?

If this is all by volumes and liquids, then
v amount of water
0.5-v amount of 10% fertilizer
10%280.5-v%29=4%2A0.5
-
5-10v=2
5-2=10v
10v=3
v=0.3------------three tenths of a gallon of water