How many pounds of nails costing $7 per pound must be mixed with 6 pounds of nails costing $3 per pound to yield a mixture costing $4 per pound?

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Letx= number of nails costing $7 per pound. The total cost of the mixture equals the sum of the cost for each type of nail orM=A+B, whereA= 7x,B= 3(6), andM= 4(6 +x). Substitute the known values into the equation. 4(6 +x) = 7x+ 18. 24 + 4x= 7x+ 18 24 18 = 7x 4x 3x= 6 x= 2

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