SOLUTION: how many pounds of coffee worth $9 a pound should be added to 30 pounds of coffee worth $3 a pound to get a mixture worth $4 a pound

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Question 807284: how many pounds of coffee worth $9 a pound should be added to 30 pounds of coffee worth $3 a pound to get a mixture worth $4 a pound
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
how many pounds of coffee worth $9 a pound should be added to 30 pounds of coffee worth $3 a pound to get a mixture worth $4 a pound
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Equation:
value + value = value
9x + 3*30 = 4(x+30)
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9x + 90 = 4x + 120
4x = 30
x = 7.5 lbs (amt. of $9 coffee to add)
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Cheers,
Stan H.
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