document.write( "Question 985298: A coffee merchant combines coffee costing $3.50 per pound with coffee costing $3.00 per pound. How many pounds of each should be used to make 40 lb of a blend costing $3.20 per pound?
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Algebra.Com's Answer #606120 by josgarithmetic(39618)\"\" \"About 
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Treat the price as a concentration. The coffees are like materials containing dollars for concentrations of some amount of DOLLARS per POUND.\r
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