SOLUTION: How much water must be added to 42 liters of a liquid fertilizer that is 0.8% nitrogen to get a mixture that is 0.3% nitrogen?

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Question 294521: How much water must be added to 42 liters of a liquid fertilizer that is 0.8% nitrogen to get a mixture that is 0.3% nitrogen?
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
first mixture + second mixture = total mixture
Let w = water
0.3(w + 42) = 0.8(42) + w
Can you solve for w now?