SOLUTION: A mixture of 5% disinfectant solution is to be made from 7% and 4% disinfectant solutions. How much of each solution should be used if 36 gallons of 5% solution are needed?

Question 792300: A mixture of 5% disinfectant solution is to be made from 7% and 4% disinfectant solutions. How much of each solution should be used if 36 gallons of 5% solution are needed?

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A mixture of 5% disinfectant solution is to be made from 7% and 4% disinfectant solutions. How much of each solution should be used if 36 gallons of 5% solution are needed?
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Equation:
dis + dis = dis
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0.07x + 0.04(36-x) = 0.05*36
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7x + 4*36 - 4x = 5*36
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3x = 36
x = 12 gallons (amt. of 7% solution needed)
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36-x = 24 gallons (amt. of 4% solution needed)
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Cheers,
Stan H.
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