SOLUTION: How many pounds of chamomile tea that costs $4.20 per pound must be mixed with 12 lb of orange tea that costs $2.25 per pound to make a mixture that cost $3.40 per pound?

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Hi,

Let x represent How many pounds of chamomile tea

 4.20x + 2.25(12lb) = 3.40(12lb + x)

             x = 1.15(12lb)/.80