SOLUTION: How many pounds of Coffee beans selling for $5 a pound should be mixed with 6 pounds of Coffee beans selling for $8 a pound to get a mix selling at $6.80 a pound?

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Question 231207: How many pounds of Coffee beans selling for $5 a pound should be mixed with 6 pounds of Coffee beans selling for $8 a pound to get a mix selling at $6.80 a pound?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
6*8+5x=6.8(6+x)
48+5x=40.8+6.8x
5x-6.8x=40.8-48
-1.8x=-7.2
x=-7.2/-1.8
x=4 pounds of $5 coffis used.
Proof:
6*8+5*4=6.8(6+4)
48+20=6.8*10
68=68