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Mathematics 5 Online
OpenStudy (anonymous):

A store mixes Brazilian coffee worth $10 per kilogram and Turkish coffee worth $12 per kilogram. The mixture is to sell for $11 per kilogram. Find how much of each should be used to make a 156-kilogram mixture

OpenStudy (anonymous):

\[12x+10(156-x)=11\times 156\] is a start

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