How much coffee costing $6 a pound should be mixed with 3 pounds of coffee costing $4 per pound to create a mixture costing $4.75 per pound?
Define your variables.
x = # of pounds of $6 coffee
Write an equation to represent the problem. Use formula
(cost per pound)(pounds) = (cost per pound)(pounds)
6x + 12 = 4.75(x + 3)
Solve for x.