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A flour milling company has two types of flour for making porridge, maize flour and millet flour. Maize flour costs Ksh 60 per kilogram and millet flour costs Ksh 90 per kilogram. The milling company makes a new brand of flour by mixing maize flour and millet flour. If the new brand costs Ksh 85 per kilogram, determine the percentage of maize flour in the mixture.

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Maize: Millet
     60 : 90
maize: millet = Δmaize: Δmillet
 =   1:5
maize = 1/6 x 100%
          = 16 2/3%

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