Problema Solution
How much coffee beans worth Php50 a kilograms should be added to 60 kilograms of coffee beans worth Php75 a kilogram to obtain a mixture worth Php60 a kilograms?
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Solution:
x = Php50 coffee bean
50x + 60(75) = 60(x+60)
50x + 4500 = 60x + 3600
-10x = -900
x = 90 kilograms