SOLUTION: Yard bird Gardening carries two kinds of fertilizer containing nitrogen and water. “Gently Green” is 5% nitrogen and “Sun Saver” is 15% nitrogen. Yard bird Gardening needs to combi

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Question 696535: Yard bird Gardening carries two kinds of fertilizer containing nitrogen and water. “Gently Green” is 5% nitrogen and “Sun Saver” is 15% nitrogen. Yard bird Gardening needs to combine the two types of solution to make 90 L of a solution that is 12% nitrogen. How much of each brand should be used?
Answer by stanbon(75887) About Me  (Show Source):
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Yard bird Gardening carries two kinds of fertilizer containing nitrogen and water. “Gently Green” is 5% nitrogen and “Sun Saver” is 15% nitrogen. Yard bird Gardening needs to combine the two types of solution to make 90 L of a solution that is 12% nitrogen. How much of each brand should be used?
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Equation:
nitro + nitro = nitro
0.05g + 0.15(90-g) = 0.12*90
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5g + 15*90 - 15g = 12*90
-10g = -3*90
g = 3*9
g = 27 L (amt. of Gently Green needed)
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90-g = 90-27 = 63 L (amt. of Sun Saver needed)
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Cheers,
Stan H.