Three kinds of coffee are to be mixed to get a blend. One kind costs $0.40 per pound, the second $0.80 per pound and the third $1.00 per pound. 110 pounds of the mix is wanted and it should cost $0.60 per pound. The amount of coffee costing $0.80 per pound should be 2/3 of the amount at $0.40 per pound. How much of each kind of coffee should be used?

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