SOLUTION: Coffee that sells for $3.60/kg is mixed with coffee that sells for $2.40/kg to make 1200 kg of coffee that will sell for $2.80/kg. How many kilograms of each type of coffee was use

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Question 232615: Coffee that sells for $3.60/kg is mixed with coffee that sells for $2.40/kg to make 1200 kg of coffee that will sell for $2.80/kg. How many kilograms of each type of coffee was used?
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
3.60x+2.40(1,200-x)=2.80*1,200
3.60x+2,880-2.40x=3,360
1.20x=3,360-2,880
1.20x=480
x=480/1.20
x=400 kg. of $3.60 coffee is used.
1,200-400=800 kg. of $2.40 coffee is used.
Proof:
3.60*400+2.40*800=2.80*1,200
1,440+1,920=3,360
3,360=3,360