Asked by Anonymous

A merchant has coffee worth 3dollars a pound that she wishes to mix with 3 pounds of coffee worth 9dollars a pound to get a mixture that can be sold for 6dollars a pound. How many pounds of the 5 dollar coffee should be used?
Answered by Kuai
3x + 9(3) = 6(x+ 3)

3x + 27 = 6x + 18

-3x =-9

x = 3
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